Should I Use The Listing Agent Or My Personal Agent?

[Manuel A.]

Simple question...

This whole time I've been using my personal agent to look at properties and put in offers, but I feel using the listing agent to look at properties and put in offers would be better, and just using my personal agent to sell. Is it better to just use my agent for everything, or use the listing agent for looking and purchasing, and my personal agent for marketing/selling. Also, who do you think should provide comps?

Any consensus on these questions?