Paci or Thumb???

beach bum
My LO is almost 2 months now. This past week just started sucking his thumb. I've tried giving a pacifier and he Gags/spits it out. Does not want to take it at all. I have heard conflicting things with thumb sucking and how hard it will be to break the habit later. I know pacifiers are supposed to reduce risk of SIDS which is a bonus. Is there a certain brand that is more preferred for breastfed babies perhaps? I EBF, so not sure if that has anything to do with him not wanting a paci. I don't want to force the paci idea as he seems content with his thumb, just confused because I've read different things on which is better for baby. What do your LOs prefer?