Having owned both the D710GA and the V71A if you're solely concerned about your scanning issue then go with the V71A. The D710GA is a nice rig but it's expensive and needs a lot of configuration done presuming you want APRS and GPS configured. There's a lot of trial & error involved but Kenwood has some good documentation on APRS and the D710GA.
The V71A is solid radio on VHF & UHF. The radio transmits 50W on either band and the display can be mounted remotely if you wish. You can display VHF + VHF or UHF + UHF or VHF + UHF if you wish. It has a lot of flexibility in that regard.
The V71A can do memory scanning and then lockout a channel quickly. The D710GA is a little bit slower in this regard. Both units have 1000 memories.
My only complaint about the D710GA is that its built-in fan is a bit loud when doing APRS. It runs ALL the time and can be quite obnoxious. I removed the stock fan and put it a 3rd party "silent" fan which was 1,000x better in terms of noise.
QRZ thread here:
https://forums.qrz.com/index.php?thread ... st-4661216