I bought Softears tips (better alternative to Xelastec, accroding to audioreviews) and aw my gawd they suck - sub bass region devastated. I thought it might be fit/isolation issue at first, but I don't think so, and they are within my regular margins for the tips.
I also bought Whizzer SS20 (recommended by audioreviews as well), and those get my approval - pretty good, especially for the money. Might not be the best for long hauls, kind of start to feel them after hours of listening.
Regular Azla is the best to me, yes they are expensive, but so is Softears, and unlike those Azla fit/sound perfect and I can wear them for ages with no fatigue at all.
I really dig the AzlaSednaEarfit tips, either light or regular. Because of the firmness of the tip, they tend to hold a seal much longer and tend to stay put in the opening of my ear canal longer than most other ear tips I tried. I prefer them most for a "shallow" fit, if that makes any sense.