For the 3bet or call decision pre-flop, it's an easy 3bet but if for some reason you have a balanced range that calls a LP raise from the blinds then KJ is one of the best hands for it.
KJ isn't bad to call OOP against a weak range, if your opponent is going to spew post-flop with dominated hands. The problem is that there aren't many hands that dominate his range that you don't want to raise for value.
Only 3betting here is better for our value range and lets us play light occasionally.
Aside from all of that, the best reason, imo, is that 3betting is simple. You know that if you 3bet xbb you need folds y% of the time and it will show an immediate proffit. This is easily figured out, consider his CO raising range and the range you expect him to call a 3bet with and if he folds more than y%, it's proffitable. Stating the obvious, I know, but I'm making a point, this line is simple, obvious, precise.
We're also underestimating our value because he will call and give us a +EV opportunity to cbet some of the time (plus, we will actually make a hand some of the time).
If however we call pre-flop, we can probably make money. There is a lot of grey area in this though. Will he cbet air more or less often against the blinds, will he float a c/r lightly, is his bet sizing on this board texture when in position bigger or smaller than normal? Overall, we have the best hand against a weak range so it's probably going to be proffitable, but we KNOW 3betting IS proffitable.
It's simple, and we're OOP so simple=good, make things complicated when you're the guy in CO and have the edge in information gathering post-flop.
Sorry for the derailing of a thread about floating...
Regarding the actual topic though, since we decided to call pre-flop in this particular hand we have to play back without top pair a lot for this pre-flop call to be +EV. What flops are we going to play back on? A high is terrible for us because we called OOP and almost never have the A, he raised in LP so there are more A's than normal in his range. So we're really looking at trying to find fold
equity on Q high flops and raggy flops, or we should have folded pre-flop.
Yes, KJ dominates his range, but it's not going to hit (and be good) often enough to call pre-flop and have it be +EV.
So we are
bluffing, and if we're going to
bluff, do we check-call or check-raise? - Because we can't donk bet, because obviously that causes too much action against regs.
Check-raising is stronger and the standard line if we hit the flop or picked up any kind of draw. So check-raising is good.
Check-calling is risky since we're building a big pot with a hand that isn't worth much, OOP against a wide range.
Out of all of that rambling, let me summarise as:
Calling pre-flop=bad. 3betting preflop=good. Check-calling flop=bad. Check-raising flop=good.