...how can i do it? one phone is better than the other

just call them, they have to do it for you. See Verizon does not carry phones with Sim cards, which in a case like this if you had a service provider that carries phones with sim cards you could easly switch your service to whichever phone you want.

Just take your phones in the store, they will switch the number and can transfer all your phone #'s that are programmed to the other phone too!