Hi stanleychs1437,
When you can’t test a mattress in person for PPP then the most important part of making an online choice is always a more detailed conversation with the retailer or manufacturer so they can help “talk you through” the differences between their mattresses and the options they have available that would have the best chance of success based on the “averages” of their customers that are similar to you (see mattress firmness/comfort levels in post #2 here). They will know more about the specifics of their own mattresses and be in the best position to provide you with the type of guidance you need than anyone else.
Having said that … there is more about the Roma in post #2 here. It is a two sided mattress so you would have the choice of sleeping on the firmer or the softer side.
Both mattresses use two layers of Dunlop latex so they both use high quality materials and there are no weak links in either of them. The main difference between their designs is that the Roma is a finished two sided mattress that has a quilted cover and the SleepEZ 6" special is a one sided component mattress that has a stretch knit cover where the layers can be customized both before and after a purchase (by rearranging the layers or exchanging a layer). Assuming that either one or both would be a good match for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) either one would make a good quality/value and very durable choice.
Again it’s usually a good idea to narrow down your options at any specific manufacturer to a single choice based on more detailed conversations with each of them before making comparisons between your finalists.
I don’t have the information I would need about the Sweet Dreams to make any meaningful comments about it (see this article)
I also don’t have all the specific information I would need about the Back Ease to make any meaningful comments about it either other than it’s a latex polyfoam hybrid that would be similar in design to the Dreamfoam Ultimate Dreams latex mattress as you mentioned. You can read more about the pros and cons of a latex/polyfoam hybrid vs an all latex mattress in post #2 here.
This would be a “value” judgement based on your conversations with each of your finalists and your individual criteria and the parts of your personal value equation that are most important to you. This is also a very high quality mattress that uses 100% natural Dunlop latex made with a continuous pour process and has a wool quilted organic cotton cover which can help with temperature regulation.
There is more about the most important parts of the “value” of a mattress purchase in post #13 here that can help you make more meaningful comparisons between mattresses and decide whether any mattress would be “worth it” to you.
There is also more about different types of quilted covers vs unquilted stretch covers in post #12 here and the posts it links to.
Once you have talked with each of the manufacturers you are considering and have narrowed down your options to a single mattress with each one and you are confident that all of them would be a good match for you in terms of PPP (or that you have good options after a purchase to fine tune or return the mattress if you aren’t) then you would be down to finalists that are between “good and good” where there are no lower quality materials or weak links in any of them.
At this point any of the mattresses you are considering would likely make a very good choice so if you are down to final choices (see post #2 here) and there are no clear winners between them then deciding which one would be “best for you” would be a matter of best judgement based on your conversations with each of them and all the objective, subjective, and intangible parts of your personal value equation that are most important to you.
Your next step in the process towards making a final choice would be a more detailed conversation with each of the manufacturers or retailers you are considering but you are certainly looking at some very good quality/value options 
Phoenix