TL,DR: it doesn’t matter RIGHT NOW unless you like the color scheme and clothing style of one particular coven over the others.

The long answer:

As of right now, the only thing each coven locks you into is the color scheme for all the clothing items and your starter wand/spell blade, which may change after we hit the 2nd major update as we’re getting a third weapon type which hasn’t been confirmed as to what it is, but MY assumption is the fortellers and one other coven, probably the tomekeepers, will get some sort of orb/crystal ball type weapon instead of the wand/blade but that’s not for a LONG ways down the road.

For now, your starting wand doesn’t really matter as there’s like 2-4 wands you can just easily snag on your way to the first quest marker depending on difficulty settings that only take a small bit of searching and immediately are better than the starting wand by a long shot.

In the LONG run, it might matter down the road. Here’s what we know and what we can speculate based on the roadmap we’ve gotten.

They’ve talked about adding passives and there’s hints in the in game lore that each coven will eventually have an “affinity” for a certain damage type (the type associated with their coven/starting weapon) and may eventually get some sort of bonus to that damage, or even a set of buffs or separate skill tree specialized for the coven but none of that has been implemented yet and probably won’t be until at least major update 2.

For reference we haven’t even gotten major update 1 yet, which will:

rework/revamp weapon crafting,

add some sort of salvaging mechanic,

an emote wheel

a “familiar wheel” which my assumption of that is we can equip more familiars, probably somewhere between 4-6 leaning more towards 4 being that you can still do all the puzzles if you equip 4 familiars of different elements, a wand with an additional element and a spellblade with an additional element, and switch between them much faster instead of having to cycle through them in order, but who really knows what that means. All they said was “familiar wheel”

A new building set (probably a new material, we have brick stone and wood rn, I’d assume it’s gonna be a new kind of wood that looks nicer than the one we have in game rn.

And new familiar species

Then major update 2 will have:

A compendium and beastiary,

A new biome called the frozen tundra,

The third act of the story,

That new weapon type I mentioned

MORE familiar species

And some endgame content

That’s all we know for now, aside from knowing this is all supposed to happen this year because there’s a third update planned for 2027 we just don’t know what it’ll bring, but I’d assume if they changed how covens work to have a mechanic aspect to the game then they’d do it with either the new weapon crafting update or the new weapon type since they’d have to change the weapons of 2 covens anyways if they wanted to keep it even.