Just like you pick a keyboard to suit your personal needs, you'll want to pick a pen for your personal needs. No one but you can tell you that. For example, I could tell you that a gold nib on a fountain pen makes for a superior writing experience. But if that doesn't fit your needs, you won't be happy with that decision. So you need to figure out what you're looking for. You've figured out that you don't want a fountain pen. That's a good start.
Do you want to be able to refill the pen? Do you care about which cartridges you use? Do you care how thick or thin the pen is? Do you want a certain material? Do you have a budget?
These are all some questions that you may want to look into. Or maybe not. No one can tell you what you need better than you can.
For me, the first thing I check for in a pen is how it fits in my hand. I don't like thin pens and I don't like very long pens. They don't fit my hand well. I also try and figure out how the pen feels when I hold it. If it's slick or uncomfortable to hold in my writing style, I don't want it. Other important aspects for me are material, section shape, colorway, durability, and usage. I also highly highly suggest you going to a stationary or pen store to try it for yourself. I find moreso that boards, a pen is very specific to you. No one writes exactly the same so how I hold a pen and write will influence my thoughts with it.
