Both are certainly better than what we have now.
I think you're underselling Nagelsmann a little bit though. He's achieved all he had achieved by the age of 35.
Poch hadn't even hit management by that age.
Nagelsmann took Hoffenheim from 7 points from safety to Champions League within a year at the age of 29. Then went and took Leipzig to the knockout stages of the Champions League for the first time in their career where he got them to a semi final. Only 3 managers in Bayern Munichs history have a better win percentage than him..
Poch did wonders here. And we'll always love him for what he did over those four or so years.
Poch and Naglesmann are actually quite similar .
1 massively overachieved with smaller and medium clubs. Saints/Hoffenheim & Spurs/Lepzig
2 developed and worked with younger players
3 stylish football with some degree of tactical flexibility although Naglesmann is a bit mroe flexible than Poch
4 football that is possessions based with a degree of pressing although not quite Klopp level.
5 maybe struggled a bit with big egos at PSG and Bayern but did both win 3 trophies a piece so certainly not a failure unless of course success is measured in CL titles.
Naglesmann back in his RB days always came across as the German Pochettino. I would take either at this point.
Forget the elite manager or up and coming manager arguement. It’s about the fit, Naglesmann to me fits Tottenham, Tuchel, Luis Enrique etc don’t.