It may take a little experimentation for you to choose the best bullet weight for you. Yes, it is somewhat subjective.
Lighter bullets usually produce less recoil, depending on the powder charge. The powder charge will vary from brand to brand and depending on the intended purpose, target or self defense. Take that into consideration, but usually lighter rounds produce less recoil. This can be an advantage when you are trying to hit a target.
At the same time, with more recoil, heavier bullets tend to strike the target a little higher, relative to where your sights appear to be pointed. Although that seems counter intuitive the reason is that the greater recoil raises the end of the barrel before the bullet exits the bore, thus the gun is actually pointing a little more upward at a critical point in the shooting process.
The usual terminology is that the Point of Impact (POI) is higher relative to the Point of Aim (POA) with a heavier bullet, all other things being equal.
Some people find it easier to have the POI higher than the POA so they can see the center of the target on top of their front sight. This is usually referred to as "a 6 o'clock hold" because the tip of the sight appears to touch the edge of the circular bullseye at the point where the 6 appears on a clock face.
Finding any affordable ammunition is a good trick right now, so you may be limited in what you can play with before making a large enough purchase to have some inventory on hand for your convenience in the future. No hurry, unless you see a great bargain. But, even then, trying a few rounds first will help reduce your chances of disappointment.
Hope this helps!
