Yeah.. The last few mg's of bupe are the hardest! I was on suboxone for a year @ 32mg's, and getting down to 2mg's was pretty easy, but the last few are freaking hard!
I think it probably just depends on what's easier for you.. For me, getting off a low dose of bupe is less painful, but lasts longer. Oxycodone for me is definitely more painful, but doesn't last very long compared to bupe.
If it were me, and I was already down to 2mg's bupe, I'd switch to between 10 and 20mg oxycodone (whatever minimum dose I needed), and just wean down to 5mg's as quickly as I could, then cold turkey it. But that's just me.
You could also stay on bupe and just start staggering your doses.. 2mg one day, nothing the next. Then 2mg again, then nothing.. Then eventually try to go 2 days without. And finally 3. After you can go 3 days without you can just kick from there.