Fashions have changed over the years regarding bars. It used to be that all XC mtb were set up with 23" flat bars and bar ends. Nowadays the rage seems to be riser bars (26" standard?) even though flat bars and bar ends are stronger and lighter.

A couple of things to consider:

width = gives you stability but makes tight turns harder
narrow = may fit your shoulders better at the risk of loosing steering stability
bend = flat bars tend to be 3-5 degree bends while riser bars are more. Many women (and men) do better with a greater bend in the bars, 9-11 degrees, because it take the kink out of your wrist.

Years ago, I cut down my flat bars to 22" because everyone said I should because I am short/small. That was the trend. However, I think I did myself a disservice because it speeded up the steering on my bike, good for slow speed technical singletrack but scary for fast and loose descents. I'm scared of heights anyway.

Last year, I took a long wheelbase bike and morphed it into a freeride bike. It got 25" riser bars. The riser part wasn't important; the width was. Suddenly, I gained huge stability and control on downhills. Wow! I looked at my XC bike with the 22" bars and had an epiphany. I needed a 9 degree bend to keep my wrists happy, but wanted wider bars. No one makes anything like that any longer as far as I know, but Seven (and Dean) will custom make flat Ti bars to the width and bend your specify. Two weeks later I had a 23.5" bar with the 9 degree bend. Absolutely superb for the XC bike. Great compromise. It has made squishing between the trees in central Oregon ST much tighter, but it is worth the gain in steering stability and I have not sacrificed wrist comfort. However, the 25" riser bar is by far better for open technical terrain like Moab and the desert southwest.

So, you need to consider the type of trails you ride to choose the bar and the compromises you're willing to make.