For me, it would depend on how each of us breaks .
1. Do you ever sell out on your break and leave a corner ball or more ?{How often in 10 games}
2. Does he sell out on his break {how often in 10 games}
If he sells out even 20 % of the time, or has a weak break that allows you to almost always hit something on his side and move it or a couple of balls to your side , in that case ,I would rather give up the breaks than a ball.
The break is only an advantage if you do it correctly almost every time.
I have seen people I played even with , that had such weak breaks, if they asked for all the breaks I would gladly raise the bet a hefty amount.
They usually know they suck though and don't want anything to do with that. .
I'm sure you don't, or you wouldn't need to ask this question , but you should keep statistics on how many of your breaks you win against every player you figure to play more than once.
If you win 90% of all the games you win against this guy on your break, you would automatically know , you can't give him the breaks , vice versa if you win 40% to 60% of all games vs this guy on your break and the rest on his,he might be taking less spot than he already gets and not even know it.
Just the fact of him asking for the spot , tells me he probably keeps track and knows it is to his advantage to get those breaks.