powerisers are the korean brand, first brand to go global/whatever, pro-jumps are a flying locust brand, from china, some say risers are better, other PJs, it's all personal opinion really, though riser springs are generally stiffer than PJ ones, but unless you're at the top of thr range (120kg ish) then it shouldn't be a deciding factor when choosing
if you're just starting out pro-jumps are probably the better choice, first they're cheap for what you get(a fully working pair of stilts, that despite the low price are quite high quality), and the customer service/spares etc is extremely good