I would suggest trying fin. If you can tolerate it, then it will help you long term and in the event of a transplant. If you can't tolerate it, or don't want to try it, i would go for 2000-2500 grafts and a reasonably conservative hairline. There is no certainty at how your hair loss will progress, so it's a chance you'll have to take.
Just my 2 cents worth, but nothing looks sadder, than a man who is balding and trying to grow their hair long, or having it in a ponytail.......:o
A short, stylish cut, with enhance the hair you have and make you look younger. You look like you have the face shape to carry a shorter cut.