I play mostly 200NL 6 max, 400NL 6max online
Most of my live action is at $5/$10 NL and $5/$5 (both $1k max, about 20%ish of pots are straddled), occasionaly dropping down a level when the game is bad or waitlisted.
I soundly crush the games I play in.

It's far easier to go online -> live than live -> online for comperable stakes.

Online players have more technically solid games and just need to learn to cope with bordem and tell warfare. Neither is as nearly as hard as learning how to read and represent hands.

Live players tend to play way too loose, call too much and under-bet the pot. Strong live players pick up bad habbits while getting heavily rewarded for attacking weaker players in more pots than their tighter counterparts. In a tighter, more aggressive online game their basic style is a slow drain of chips they can only over-come at the softest tables.

Even in the $1k live games with a tighish, lineup plays like blind stealing and isolating weak players must be done with more care because there is no shortage of bored players willing to play a neutral to slightly -EV spot for a moment's entertainment. Also, as you move up the live ladder c-bets will similarly get attacked. It can be tricky to find the right bluff vs value balance.