My first four horses were geldings. Number one was a saint despite his lack of actual training (and no comments about green on green, I was seven and had no say) and would do anything, or at least attempt to, you told him to even if he had never actual been trained to do it. He was jack of all trades, master of none, but we had fun anyway. He was one in a million and I still have him. Number two was and absolute train wreck mentally and physically, long irrelevant story there. Number three I'm getting ready to sell because, despite being a great horse we have completely different goals in life. Number four I'm also selling. He's a rescue with the personality of a rock and the brains to match.
Now, my little mare on the other hand, is the smartest little thing I've ever swung a leg over. She's still green, but it usually takes her three tries or less to get a new exercise right and she will do absolutely anything to please. She has convinced me that mares are the way to go.