I prefer stocks, but mainly because I completely dislike backbottle, and bottomline setups. I've long been a fan of the vert setup. So long that anythings else feels odd.
As a side result, most of my guns utilize some sort of stock. T-stocks are my favorite, but I also like L-stocks, gasthrus, and woods stocks. I'm not picky.
But to answer the OP's question, stocks fell out of style in the late 80s. Guns started getting backbottles, making a stock redundant.
But then came back in style briefly in the early 90s when guns started coming out with vertical adapters for a more compact setup. People, like myself found you could then add a stock. But this trend ended as co2-UNfriendly guns needed ECs, LPCs, and regs to function.
Since then everything has used bottomlines. Bleh
Anyway, here is some stock porn: