best overall upgrade from 8.x?

[Royce Williams]

I have some 8.x boxes that I'm looking to start planning to transition
before 8.4 is likely to go EOL next year.

All other things being equal, what's the general consensus on where to
upgrade to from 8.x ... 9.x, or 10.x?

I do know that YMMV, and I also know that 10.x is likely to be
supported longer.  I'm just looking for people's overall impressions.

Royce