Mango tenors usually have a warm sound to them. Do you want to emphasize that, or counter it with bright strings?
Do you prefer Nylon strings? Think traditional Hawaiian sound.
Or, Fluorocarbon strings. More guitar-ish sounding.
Or, something that sounds a bit of both? (Aquila Sugars.)
My go-to tenor strings are Living Waters fluorocarbon for both Low-G & Hi-g. I just like their sound. Plain, no wound strings in the sets. But they aren't best for all tenors. I have a set of Worth Brown Medium fluorocarbon strings on my Pono Mango tenor. I like the very warm sound the combination gives. But it's not right for everyone.
I agree with Ukecaster. If your uke has Nylon strings on it, keep them for a while and see if you like them. (Many new ukes come with knockoff Aquila Nylon strings. If it doesn't have a tag that says "Aquila," the strings may not the real thing. Martin M620 strings are a good starting point for trying Fluorocarbons. Give both a couple of weeks to settle completely and you to get used to them. If you like them, great! Which of the two do you prefer? Then explore strings in that category, either Nylon or Fluoros.
You'll narrow the field pretty quickly. You may want to keep notes on what you tried and what you liked and disliked about them.
Most of all, have fun. They influence the sound of your uke a lot. And seldom will a set sound bad. So enjoy the experience.