Based on the Fallout wiki, it seems that Synth armor is better than combat armor once you get the heavy variant. Can anyone else attest to this? And it seems that the armor is very very rare so far...and will always be white no matter which material mod you put on it.
(It would also seem ironic to use Synth armor for a character who is going to side with the Brotherhood for the end-game...from an RP standpoint.)