Price mostly, but I like the WR-25 absolutely as well as the Ulano...if not just a skoshe better.
I don't worry too much about EOM, but I am aware that this is considered a serious error by several people on this board that I TRUST explicitly. I print all manual, and the screenprint area is mostly all ME from separation to conveyor's end. (Except for a sweet, hard working, notably attractive part timer. Wish she coulda been a daughter in law, but I digress.) When I move to an auto, if ever, I might put a fresh battery in my micron gauge.
If you want to try the Ulano, you'll find it an excellent emulsion that holds detail nicely. They know what they're doing.
I do think the WR-25 reclaims a little easier, but I shouldn't really assert that, since I didn't have a dip tank at the time. If your chems are different, dismiss everything I've said. Too many variables.
I get a RIDICULOUS number of screens from a gallon of CCI. But I use the sharp edge, 2 over 2. I know, I know...that is all wrongo. But there is more than one way to skin a rat. You see, I DO print shirts. I get paid. I see my customers again and again. (Well I don't, but the girls do.) If I move to an auto, I will become a FRESHMAN all over again, despite the fact I'll surely by over 60 by that time.
You'll like the Ulano, but if you print BIG numbers of DISCHARGE you might want to consider a hardener. That is the case with most all emulsions. (I THINK...)