So raiden is better cause she is more flexible....as she can be used in pure dps teams and em teams...you can make her into a sniper with nahida etc.....but the only thing here is raidens rotation takes more time than navia...that wouldn't be a big issue with actual boss battles..but navia is fresh and fun to play with...navia does insane dmg with less effort too...in the end both are fun to play
Yes you are absolutely right raiden shogun will take some investment but provides better value to the account than Navia is more fun to play without needing much investment