Rotation shoe and half marathon shoe

I already have Puma VN3 as my daily trainer and used it for my 10km running event last Sunday. Gusto ko sana ng new addition to my daily rotation that I can use for my half marathon on Oct 29, Nov 9, and Nov 30.

My current options are Boston 12 (currently 50% off), Vaporfly 4, and Zoomfly 6. (VF4 and ZF6 might be at 30-40% on 10.10)

Should I buy a shoe I can only use for my race day and settle for my VN3 as my only daily trainer OR buy a shoe I can add to my rotation and can be used for my half marathon events? Other recommendations will be appreciated.