I would suggest to use a mixture of the both, but the Sponsoring should be different.
Roblox has a sponsoring feature, it is sort of similar to advertising. Advertisements can be blocked by an adblocker, and they are on PC only. Game sponsoring is when you big on a sponsor, and your game shows up somewhere on the game page as a Sponsored game. It can’t be blocked by ad blocker; and it is available to be viewed by Mobile and PC users.
I’d suggest bidding more into the Sponsoring feature for a Game, and the advertising feature for a group.