Backing and Partners?

[PokherJoe]

I play B&M mostly and recently I have been asked to partner in a 25-50 NLH/PLO game at an area casino.

The offer is that we would both put up half the buyin and split the profit. No long term agreements. What is the normal cut in a partner situation?

I have also recently been offered to be backed in this game. I am to play on 10k for 2-3 sessions as a tester, and we will split the profit after. No long term agreements. What is the cut for normal backing situations.

The obvious question is why would I partner (Investing 50% and getting 50% profit), instead of being backed (Investing 0% and getting 50%)?

The main question I have is what tpyes of longer term agreements should i consider for each situation?

On a side note I have played this game on my own bankroll a few times and have a very marginal profit, but its really a game far beyond my bankroll, but have a job and can take a stab every once in a while.