hi guys!
if i wanna stay with all my 32 bits plugins, is it better to install X2 or X3 32 bits? tx

I'll take a stab at it:
 
X3 has bug fixes over X2, so I would recommend X3 (32-bit) over X2 (32-bit) if all you are using is 32-bit VSTs.
 
 

Another recommendation for X3. Make sure to update X3e.
Here http://www.cakewalk.com/S.../By-Product/SONAR%20X3
From memory the updates are cumulative so only x3e needs to be done. If it turns out that they are not you'll get an error message about not having the correct version installed. Just download the other updates and install alphabetically.

ty