In the long run Jonin Minato will easily outshine shisui with his bond mystery which does insane damage with tag+paralysis, and his synergy with 5 kage madara(obito). Although right now shisui is dominating but when we start getting the new ninjas/updates, shisui's usage rate will drop in the long run as in cn he's rarely used. It really depends if you want to invest in the long run or go for the current meta. I would recommend getting shisui now so you can dominate in the current meta. Assuming you do every coupon activity in naruto online you can get minato in 2 1/2-3 months waaay before the bond update.

1. The cn meta is really diverse and it's usually based on pos1 vs pos 2, initiative, who's team counters the other, and rng to deem the victor of the fight. A lot of old ninjas are still viable like kcm naruto.

2. No one was ever screaming for shisui to come to us servers because he's never been truly game breaking in cn, sure he was powerful but there was still better/cost efficient options. In fact the only wanted ninja that i saw that was begged was edo hiruzen.

Not cheaper shisui's 17.6k while the cheapest price for jonin is 9.6k but he's waaay better than jonin minato.