Personally Madara 10tails is only amazing at higher BP and with 4 star BT, Shisui is good but not recommended with todays meta.

Obito is awful and Ronin Naruto is only good with a high BP that can 1 shot or come close to being able to KO a team quickly. Whereas 50k is a goldmine for increasing BP if spent properly. (I'd pick the 50k) It'll help in the long run.