One web site that I've found helpful for comparing ductless mini splits is the
Air-Conditioning Heating and Refrigeration Institute.
Being able to compare specs like HSPF and Btu output at 17°F might help you in making your decision.
When doing a search, I will usually select the search option for active systems only, it will help narrow down the field of equipment so that you're not looking at older discontinued equipment.
Hope this helps,
Kenny