If I were a grandpa, I would choose Tyros. If I were younger and needed to save $$ and since I have much time, then I would choose PSR3k. For me, life is too precious to settle for less if I have the money.

Have you played both boards ? The keyfeel in Tyros is better than 3k IMO which is its main advantage.

The HD and the other stuff is probably not a big consideration unless you are a real pro requiring many storage space for your gigs. The vocal harmony is the one I am not so sure. Are they the same quality ??