Hi Jona91,
Welcome to our Mattress Forum! I am glad you have found us. 
Thank you for your kind words. We certainly appreciate it. It’s good to know that the site is useful and able to prepare consumers for a successful mattress shopping experience.I am glad you read through the site articles and learned enough basics to be able to steer clear of the MI money-making machines. There is a great deal of hiding behind marketing stories and downright misinformation that so often comes with making a profit.
I am pleasantly surprised with the level of detail and transparency of Ravensberger Matrassen and the range of products they offer. It looks like their customer service is also excellent. They would be a good addition to our Trusted Members.
This is one of the most common questions on the forum (ie. which mattress type or firmness level would be better for me? The short answer… it is wildly different from person to person because there are far too many variables and unknowns (body types, sleeping styles, preferences, physiology, age, health conditions, sensitivities, special circumstances, etc) to use any formula, specs (either yours or a mattress), or “theory at a distance” based on basic height/weight/sleeping position information or any other person’s experience to choose a suitable mattress that can possibly be more accurate than your own careful and objective testing on local mattresses (using the testing guidelines in the tutorial post) that you can use to decide on a mattress that is “best” for you in terms of PPP (whether it is for local purchase or as a guideline for online purchase)
I’ll do my best to give you some insights that you can run by your needs, preferences, and by your Mattress buying personal value equation along with other things that are most important to you (including the price and the options you have available after purchase if your choice doesn’t turn out as well as you hoped for).
Price-wise they are both the same and they both use good/quality components. ErgoSpring is slightly thicker at (23.5 cm) vs Ergo-MED at (21 cm.) ErgoSpring would be more breathable and temperature regulating than the All Polyfoam HR mattress. Ergo Spring has two firmness options in one (as it is flippable) vs Ergo Med that comes in one firmness only (however you can choose from 3 available firmnesses). While a true HR polyfoam (like the one used in Ergo-MED) is one of the highest grades of polyfoam with high-performance polyols in its formula it only approaches the qualities of Latex. The Latex in the ErgoSpring would more durable in any layer. The Ergo-MED is sculpted and engineered to render the 7 different zones but ErgoSpring’s latex in combination with the spring is naturally more point elastic (takes on the shape of the body which provides an even support and aids in pressure relief), has a higher support factor (gets firmer faster with deeper compression which helps with deep support), is more breathable (regulating humidity and temperature), has higher resilience, elasticity, and “liveliness” which provides for a better “feel” for most people, is more natural than polyfoam for those who prefer more natural materials, has fewer complaints about off-gassing and odor, is biodegradable, is less flammable, and is overall a much superior material in any layer
Having said that … it all depends on you and your gf’s needs and preferences.
(23.5 cm) ERGOspring® 1000 7-zone tonvormig pocketvering matras construction
• 4 cm Dunlop Latex (Blended 20% NR & 80% SBR) from Latexco (SG 72)
• 1000 pocket springs (at 100 x 200 cm dimensions) Barrel-shaped and electrothermally hardened springs (Wire gauge 1.8 / 2.0 mm (7-zone division) 7 turns and wire length 107 mm
• 4 cm Dunlop Latex (Blended 20% NR & 80% SBR) from Latexco (SG 72)
• Pocket springs from AGRO Germany
• Manufactured by Van Landschoot Belgium
Is a flippable mattress with two firmness levels (H3 medium-firm for higher BMI individuals and H2 soft-medium for normal range BMI sleepers up to 95 kg) The springs from Agro are double tempered and of good quality. The barrel-shaped springs increase resistance under more pressure. It is a durable unit with thermally hardened springs and good point elasticity. I’d ask them about the density of the polyfoam perimeter edge they use which sometimes can be the weak point in a mattress and can degrade over time if lower density foams are used. The high-low technology designed by Van Landschoot is intriguing. “Slightly higher and lower springs are alternated” to create the 7 zoned mattresses. Between the pocket springs and the latex cover is a 400 gr/m² felt (wool and fixed with latex) for good pressure distribution. The cover is stretchable Tencel
(21 cm) Ergo-MED® 70 Topsegment 7-zone HR koudschuim matras
• Both Comfort and support are achieved through the proprietary sculpted HR polyfoam with 7 zones (SG 70)
• Cover is made with Green-Cotton® ticking with Lyocell and is 4 way zippered and washable
All in all the best way to know for sure is for you and your girlfriend to pay Ravensberger a visit and try both beds. I hope this breakdown helps with deciding which of these mattresses is best for you. I’d be curious to learn about your decision and what led to it.
Phoenix