Company has two founders at 50/50 ownership. Partner B wants to exit, Partner A wants to stay onboard and maintain current role.

Considering a 70% total equity buyout - all equity of Partner B and and 20% of Partner A.

In this scenario, does an stock sale make more sense than an asset sale (since I am not 100% buying the business)? Also, should there be a seller financing and earnout on Partner As equity? Since he is staying on-board he still has "skin in the game"