I have a lot of time in various Cherokees, ranging from PA 140's to PA 28R 201T's. Personally, I like flying Cherokees better than I like flying Cessnas, and Cessnas, especially 172's, are about as simple as they get.
I like low wings. You do lose the gravity fuel system and have to deal with an electric pump, but, big deal. My Turbo Arrow did not require normal use of the auxiliary electric pump. I suppose the mechanical pump could fail but jeez, it's at least as reliable if not more reliable than the engine itself.
172's float. Warriors float less. Arrows sink, especially older Hershey Bar winged Arrows. That is both a detriment and an asset. I have to use a fairly wide pattern to land a 172 without going high. In a Cherokee of any type, I can fly a fairly close pattern and it wouldn't make a lot of difference whether my engine was working or not, I'd still stick the landing. Hell, my Arrow decent profiles resemble helicopter approaches.
I say just get proficient in one, get your ticket, then start training in others. That's what it's all about.