Hi ckp,
You were probably fortunate to find the Snowmass because they are apparently discontinued and I’m guessing only a few stores have them.
My goal is always to help people eliminate all the worst choices and then focus on the better ones so that all their final choices are between 'good and good" which is exactly where you are. At this stage it’s really a matter of deciding based on all the tradeoffs that are part of each person’s “personal value equation” which are all the objective, subjective, and intangible parts of a mattress purchase (not just the mattress) that are more or less important to you. There is no real “better or worse” at this point only preferences and tradeoffs.
I would first make sure that any comparisons are mattress only to mattress only and exclude any foundation or other accessories. From a commodity or “raw materials” point of view the Snowmass may have better value but the Lebeda is also two sided which is also a “value” bonus and will be more durable than a mattress that is one sided. It’s also more costly to finish a mattress on both sides.
The ILD’s of each mattress are “comfort specs” and have no bearing on quality of value except to the extent that a mattress that provides you with better PPP (Pressure relief, Posture and alignment, and Personal preferences) is more “valuable” to you than a mattress that doesn’t match your needs and preferences quite as well. Layer thickness and ILD work together in terms of softness so the Lebeda has a thinner comfort layer but a softer support layer which together produce the feel and performance that you seem to like.
They both use latex from the same supplier and both are blended Talalay.
So overall you are looking at two good choices and I would go through the list in the earlier link so that you can take into account all the benefits and differences between each purchase (including the mattress and also all the other benefits and options that come from purchasing from each manufacturer) and then decide which is the best value based on your personal value equation. I also believe that in a decade or so down the road you will remember much more about how well you slept on a mattress than you will about how much you paid (although of course the price you pay is also an important part of “value”)
You are in a better position than the vast majority of consumers that by this time would normally be choosing between “bad and worse” in terms of quality and value 
So while I can’t tell you what to choose … hopefully this will help you with how to choose between them.
Phoenix