I know that I usually don't have to spend a lot of time figuring out which group I am going to take on an open table. I always look at the 8 first, a lot of times that will help you decide on a group, then I look for tied up balls. I do spend more time figuring out my shot order and that happens regardless of whether its take what you make or open after the break. I think with either format its a horse a piece as far as time goes.the rule where you can chose favors the better breaker and ball pocketer. hurts the mover and weaker player the most.
the rule take what you make also favors the better breaker but not as much as the choice after the break.
as far as speeding things up it makes the breaker leave the table if he misses on the break and continue immediately if he makes a ball.
it doesnt have him standing around trying to figure out all the best possible run outs to chose from. and slow players take full advantage of that and rightly so.