I have had both in my system.
I do not think that the Arcam 73t is more 'detailed' than the Rega Planet 2000. I think that the detail levels they retrieve are similar, but that the presentation of the Rega is subtler and can give the impression of 'less' detail. Be sure that you have enough clearance for the top loading rega if you go that way.
When I was auditioning the 73T it was a fairly balanced player, except we found a few audio tracks where it utterly fell apart. Namely, anything at the top end of the frequency spectrum. I'll link to my original roundup on Audio Asylum so you can read in detail if you'd like.http://db.audioasylum.com/cgi/m.mpl?forum=digital&n=85793