I have both a Dragon and two CR7a's and I think each has
its place. If your tapes have enough high frequency content
(>3kHz), the Dragon's auto azimuth works well and saves
the time it will take to setup the CR7's manual azimuth.
Lower fidelity tapes may benefit from a manual azimuth
FWIW, I think sonically the CR7 is SLIGHTLY better than
the Dragon, with the transport of the Dragon being slightly
better than the CR7's.
You might want to look at the Studer A710 deck as well. It
does not have an azimuth adjustment but is also great with
good source material.
If your tapes are Dolby encoded, you also have the choice of
using an external decoder. The old Dolby 330 (for B & C) is
great and the newer Dolby 422 (B, C & S) is very good.
Both outperform the built-in decoders.