The decision between dice rolls and freeform is one of those things that should be put to potential players early. See what's most popular with a given crowd. A dice system might attract some people and drive others away. Neither is better perse, ups and downs to both.

If you decide to go with the honour system just be prepared to crack down if necessary.

Overall just give as clear an image of your game as you can. You don't need to post a novellas worth of backstory and lore to pitch an idea. Just give people a solid idea of what they might be in for. Per mechabics and structure