10 to 12
(Ooh sounds like a good title for an episode)
Ten- You know *Puts on a Scottish accent* Your accent has kinda of rubbed onto me. I kind of like it!
Twelve- ....Needs work
Titan Comics has done a number of multi-Doctor events, and 10 and 12 have an interesting relationship across them.
When they first meet ("Four Doctors," which actually has five, arguably six), their relationship is quite antagonistic. Ten calls Twelve an "abomination," recognizing that Twelve can't and shouldn't exist. But time is breaking apart, so Ten puts aside his issues with Twelve. (Eleven is very much a moderating influence.) Twelve is a little hostile to Ten's post-Donna companion Gabby, which is ironic...
The next time they meet ("The Lost Dimension"), Ten doesn't remember the events of "Four Doctors," and they get along great. Ten simply assumes Twelve is the next and final incarnation. Nine, Ten, and Twelve have to go on a mission to rescue Eleven, who got caught up in some Cartmel Masterplan shenanigans.
We also see Twelve passing some information on to Ten that Ten needs. (Titan's Twelve likes getting involved with his past selves. He also shows up in the Eighth Doctor's mini-series.) I don't remember if this was before or after "The Lost Dimension," and in any event there's no indication when this occurs in Twelve's timeline.
And then Gabby, travelling with Ten, casts herself into the Vortex where she's saved by The Moment and rescued by Twelve sometime between Clara and "The Pilot." Gabby hugs the unhuggable Twelve, and I was not expecting a
Doctor Who comic to ever make me emotional, but this did when it was published. Maybe Twelve was hostile to Gabby in "Four Doctors" because he remembered her sacrifice -- that's another companion lost in a short period of time, and I'm not sure where Gabby falls into relation to Matthew and Emily -- and (thought he) knew her fate and was reacting from that. Then while he barely interacts with her in "The Lost Dimension," he at this point knows what happens to Gabby (he rescues her and they have adventures) so he doesn't need to put up defenses.
I would love to see Titan finish Gabby's story. I want to know what happens to Cindy and Noob. I want to see what happens to Alice. Won't happen, but I can dream.