For competitive BR, the MARCH is the top dog and used in all disciplines and distances.
If you dont have that type of $$, Sightron, Weaver, Leupold whether fixed or variable show up more often.
Depending on the rules, you may not be able to use scopes like NF due to weight limits. If weight is an issue, fixed front AO 1" scopes are lighter then most 30mm side focus variables.
The weaver fixed 36X is a standby used by many shooters. Doesn't have all the bells and whistles offered by some newer products but it is a solid, well priced scope that just keeps on ticking.
I am partial to the new Sightron SII Big Sky fixed 36X. Wider field of view, longer eye relief, more elevation adjustment, I feel better optics. More money but I feel a better scope.
The last gen SII 36X competed side by side to the Weavers and are of similar tech.
From there, you have variables of all manner and size.
Good thing today is that most main brands work very well and it is just a matter of finding what you like, fits your budget, and discipline you want to compete in.
Go to a few matches, chat with the competitors, see what they shoot, if possible, look through their scopes.
Your answers will come very quickly... reticle choice is going to be very important. What I want in a BR rig may not be ideal for plinking at LR rocks and vice versa.
Jerry