Adcom 710 2 ch peramp vs 565 worth upgrade?

I have an Adcom 565 per-amp, have seen the 710s in the 2 channel format. Is there anything to be gained by upgrading or is the 565 still good enough ? Both have phono channels, needed, 2 channel, wanted, 565 barely used. Input wanted please.
I don't personally know but I asked a local store that was an Adcom dealer your question approximately six months ago. He said the 565 was the better preamp.
Thanks for the feedback, I appreciate it.

Take care