what in your opinion is more key to a contending team. a bench big or a bench point
Not sure if you are talking about college or the NBA.
In college the elite (contending) teams generally have both depth at PG & PF/C. Having depth at both positions is very important. It is really just a personal preference as to which is more important. If it was my team I would rather have depth at PG. You have to have someone who can bring the ball up the court & set up the offense.
If the question is, what's more important, depth at PG or at Center, the answer is an easy one. Big men commit more fouls than anyone else so you need more depth in the front court.
In terms of college vs pro ball, depth is much more important in the NBA. Why? Because they play an 82 game schedule, 48 minutes games, and they don't have TV Time Outs every 4 minutes like the college game.
Those irritating, lengthy time outs every 4 minutes in college basketball give players lots of additional rest. Think about it, they literally stop the game 8 different times and show about 4-5 minutes of commercials per time out. That's about 32 to 36 minutes of rest per game. I think it's reduced the importance of depth in college ball and changed the nature of the game.
On a side note, those game stoppages are insane. I realize they have to collect the money, but if they eliminated one break per half and instead stop the game once every 5 minutes [instead of every 4 minutes], that would mean 3 commercial breaks per half and a total of 6 for the game. That's far better than the current 8 commercials per game and they can still make big money without impacting the competition as much as they do now.
Depth in the paint is key at any level of basketball. It's more than likely you can have an off-guard who can handle some PG duties and give your starting PG a breather. With big men, you need to be at least two deep at both PF and C to be successful. It wouldn't hurt to have a big SF that can play some PF or C in a small lineup in case of foul trouble or injury.
I think having lots of big men to spread out the fouls is almost a given. But as I mentioned above, some changes really need to be made in the college game. Please read my comments above.
Stopping every 4 minutes for 4-5 minutes of commercials is more than annoying and frustrating to basketball fans, it's bad for the game. Years ago depth was a factor and you could pressure a team trying to wear them down, but with so many time outs, that's no longer a viable strategy.