Hi straightjacket,
While I can’t tell you which of these is more suitable for you (your body and your testing will be much more accurate than any “theory at a distance” I could suggest) … I can tell you that all the mattresses you are looking at use good quality materials.
The gel memory foam used in the Restonic is made by Flexible foam and in the Dutch Craft is made by Hickory Springs (see post #30 and #31 here for misters research and my reply that identified this) and both use gel that is mixed into the memory foam rather than larger particles of gel which is good (see post #2 here about the different types of gel memory foams). This adds some thermal conduction to the memory foam (see the end of post #4 here about the different technologies that can affect temperature) but most importantly the sleeping temperature of a mattress is a combination of many factors which you can read about in post #16 here along with post #29 here so the gel foam is just one piece of the puzzle which can have an effect until the temperatures between your mattress and your body equalize at which time ventilation and humidity control are the most important part of ongoing temperature regulation. Every layer of your mattress, ticking and quilting, and the mattress protector, sheets, and bedding will have a positive or negative effect on the sleeping temperature of your mattress … not just the gel memory foam.
You are correct that the latex will likely sleep a bit cooler over the longer term and that it transfers a little more motion than memory foam (but still in the “good” range") and is a more lively and resilient material and a little more costly. The pressure relieving abilities of both materials are very similar (depending on the specific layering of each mattress) and it will also likely be more durable than memory foam (although swirled gel memory foam is a durable material as well). Which of these tradeoffs are most important to you is a matter of personal preference … and I know from personal experience the difficulties involved in eliminating good choices 
I do like that the comfort layers of the Dutch Craft are slightly higher quality overall and they could also be a little less “risky” in terms of alignment because there is a little less memory foam in the upper layers which would put you closer to the support layers of the mattress but this would depend on how your weight and body type interacted with the mattress and on how good the pressure relief was on the Dutch Craft models compared to the Restonic (which you said were similar).
It seems to me that your choices are good ones but as I mentioned before I would probably be leaning towards the Dutch Craft models in terms of quality/value.
Phoenix