I just got my hands on a 1 gen AT700 3u, and will compare it to my usual singles racket VT 70 4u. First impressions is that the AT700 is a little more HH and diff in ballancepoint is 2-3 mm. I feels as the AT700 is more a big arm racket and the VT70 is usable with wrist aktion it might be the diff in u3 vs u4.
To compare the AT700 with the VT70 like it says in the headline recommendation/comparison. So that if you liked the AT700 you might like the VT70 if it turns out to be about the same.
Yes, you really should at least compare it with a 3U VT70. You can almost draw the conclusion here beforehand but nevertheless it is worth something to put it down on paper (post it here).
This is not a review and don't help much. IMO is a comparison only useful with close rackets, same weight class and same string an tension.