For a first moot, most students aim as high as they can. It is an understandable instinct and usually the wrong optimisation, because the purpose of a first moot is to learn the format, and prestige has little to do with how much you learn.
What a first moot should give you
A full cycle: reading a proposition, researching, drafting a memorial to a specification, and speaking before a bench that pushes back.
Everything about that cycle is unfamiliar the first time. Doing it once, completely, teaches more than being marginally involved in something more prestigious.
Prefer competitions where you will actually speak
A very competitive moot may mean elaborate internal selection, a large team, and a real chance you spend the cycle researching without ever addressing a bench.
Research is genuinely valuable, but it is not the part that is hard to learn on your own. Standing up and being questioned is.
For a first outing, a competition where you will certainly speak beats a more celebrated one where you might not.
Subject matter should be something you have studied
A first moot is not the moment to also learn a new area of law from nothing.
Constitutional and criminal law propositions tend to be accessible earlier because most curricula cover them early. Specialised propositions in arbitration, competition or space law are excellent second or third moots and punishing first ones.
Read the timeline before the prestige
Look at the registration deadline, the memorial submission date, and the oral rounds, and lay them against your semester.
A moot whose memorial deadline sits in your examination fortnight will go badly regardless of how good the competition is. This is the most common avoidable mistake, and it is visible before you register.
The moot court listings show registration deadlines alongside competition dates so the clash is apparent before you commit.
Logistics are part of the decision
Travel, accommodation and registration fees are real constraints, and there is no virtue in pretending otherwise.
Virtual and hybrid competitions have become common and are a legitimate way to complete a first full cycle at low cost. The learning is largely the same; only the atmosphere differs.
Team composition matters more than you expect
Two or three people will spend weeks together under deadline pressure.
Choose people who will do the work rather than people you enjoy sitting with, if you must choose. A team where one member disappears in week three is a far worse experience than a less prestigious competition.
After the moot
Whatever the result, write down what you would do differently while it is fresh: what you underestimated, where the bench pushed hardest, what you wish you had read.
That note is the actual output of a first moot. The certificate is secondary. Before the next one, reading the proposition properly is where most of the improvement is available.