I have recently come across a game which allows mid shoe entry and partner betting at a high limit table.

I have traditionally only played in play-all situations before and have rarely seen HL tables where this is allowed so this concept is new to me.

My question is, is it better to wong in aggressively opening 2 new squares (but eating cards), or is it better to partner bet behind another player but risk that he/she is obviously not playing using the right indexes or even basic strategy for the most part. Let's assume they control the square and do not ask for your opinion to play the hand.

Which strategy is better?