I am not sure if it's a no brainer or not.
What could I possible miss by exchanging my Tuvala gear?
I know you can tag gear to other chars, or you can use an exchange coupon for gear so other chars can have a weapon instead, will I lose the option to do that if I exchange it
or would you guys recommend exchanging it anyway? I mean you cant sell Tuvala gear on the market.

The difference is, Boss gear can be enhanced to PEN boss gear which is better than PEN tuv gear. Of course that's assuming BS doesnt hate you of course. in other words, if you do want to take that chance on enhancing, do so at your own risk.

You only want to enhance those boss pieces to pen if you plan on converting them to god otherwise its wasted ressources on a dead end.