I like pump just because it's cheaper really. I can put the money I would otherwise spend on paint alone towards playing again next weekend or the next or the next after that.
Same game, similar gun, it just shoots differently. And you get to play more
After that, there's just a nice spirit about playing pump. With electros, your gun does a lot of the work for you. You can play skillfully and do well with an electro. but with a pump it's a necessity. Finesse is a requirement haha.