I don't regret our purchase of the WiFi version since there haven't been many aerial business opportunities for us yet (fingers crossed for the spring). If business picks up we will consider buying a Premium and keeping the WiFi as a backup. That said if the fabled 1" sensor upgrade camera is ever released I may be more tempted to buy that instead of a Premium, since we never fly out of sight and the step up to 20MP 1" sensor would be huge.
I haven't been out far enough to lose signal yet but have gotten plenty of weak signal warnings. We don't fly beyond VLOS so I'm not super concerned about it either way but it would be nice to avoid those warnings and also not have to connect to the WiFi network which is just an additional step before each launch.
Literally the only advantage of the WiFi version is price, haha
so if you're on a budget you could buy a new WiFi + two extra batteries, filters, whatever, for the same price as a new Premium. But the Premium comes with a case too so consider that if it's something you need. Also if you're patient you can find good deals on used Premiums with extras in the classifieds section.
EDIT: One thing I forgot to add is it is has been a PITA to get maps working right on the WiFi version. I have heard, and would assume, this process is much easier on the Premium since you can be connected to a cell network and the drone at the same time.