The language you use is largely irrelevant - it's the team you work with. If you want to work with the language du-jour you should find a founder who is fluent

The language you use is largely irrelevant - it's the team you work with. If you want to work with the language du-jour you should find a founder who is fluent with that language. If these are the technical founders you want to be with - then you should let them decide.