Just purchased some regular Triniti and Triniti Pro balls. These balls are really great, IMO. They also last a really long time and don't lose their bounce after weeks of play.
The main difference between the Pro versus regular.
1. Slightly bouncier
2. Higher quality, more visible yellow felt
3. Ball lettering is higher quality and lasts longer.
4. Not as much of the "pop" sound vs the regular Triniti.
I've hit with others without disclosing the ball brand. Nobody has noticed anything amiss.
For the small price difference, go with the Triniti Pro.
Just ordered a case of Triniti Pro after trying both in the individual sleeves.