The hitting arm structures are less a matter of choice than of some natural affinity that is difficult to explain.
I worked with a player in the top hundred who was obsessed at the time with Agassi and wanted his arms straight. No matter what he tried--and I tried to help him--hitting one handed backhands, hitting straight arm opposite arm forehands--when it came to matches he was bent/bent. That was over a period of months in which he made huge technical changes in both his forehand and his serve, so it wasn't that he wasn't willing or capable.
Most men aren't bent/bent but some are.
As for the grips, rigid categories don't work there either.
You see bent/bent women like the Williams sisters with eastern forehandish bottom hand grips and semi-western top hand grips.
You see bent/straight men with very strong bottom grips (Hewitt) or milder ones (Djokovic) or very mild ones (Nalbandian) that are all some version of a continental.
You see Nadal who is straight/straight with a pretty strong bottom hand grip and a semi western top hand.
Then there is Agassi also straight/straight with a mild bottom hand continental and and eastern top hand grip bordering on mild continental.
There is a range of options that will work with all the configurations.
10 or 15 years ago I devised the terminology for the arm shapes based on studying high speed video of dozens of pro players. Players need to do the same--look at themselves in high speed video frame by frame.
One great test is hit left handed forehands then one handed backhands. The better the one-hander the more likely the player can be straight/straight or bent straight. If the left handed forehand is stronger you are likely better off bent/bent.
A big caveat here though is that all this is irrelevant without certain core fundamentals. These include a unit turn, an outside foot set up on balance, the completion of the turn at the ball bounce, a controlled backswing size, contact point appropriate to the arm configuration, and extension of the swing.
Like a lot of discussion on this board, there may be an assumption here that problems are all about complex technical points like the plus and minus of arm configurations when correcting glaring more basic flaws would solve most if not everything.