@Manasseh Arnold -
Loyalty is key to any business relationship, whether it's suppliers, professional individuals or parties to the agreement. Why should an agent be loyal to you and give you his best if you're playing both sides?
Find one agent you like and cut the other out or you may find both agents will stop working with you if you're not loyal to either.
Regardless of ethics if you use one agent and sign a buyers representation agreement (often included in offers, you might not remember signing) and then close with another agent then theoretically an agent can recover a commission from you. You can end this agreement at anytime - it's more a gesture of good faith.
In reality no agent will try to recover a commission from you as it's terrible publicity but it's something to bear in mind.
Now if you use 2 agents and one specializes in multi-family/commercial and the other specializes in SFHs then that's a different story.