From my experience, (my Boba is G10 and DN is G11), Boba is way more squishy than DN and can't take a hit very well, especially when you load up his mod slots with speed heavy mods instead of protection. DN is very tanky, even with speed over protection (mine is around 80k health/protection at G11 5*). The zeta on DN's unique makes opponents more squishy with 20% health down and you can kill them quicker, where Boba's zeta only recovers his protection to take a couple more hits. I'm not an expert by any means, but this is my observation from trying to use both of them on many different squads.