Potty training boys underwear

I wasn't planning on trying potty training for a few months since we tried last week and it didn't go well. Today he decided he wantrd to use the toilet and he ended up doing great. Had a few accidents but made so much progress. I've started looking at underwear.. I honestly don't know what type I should buy. Should I buy regular or should I get the training underwear?? I'm at a lost lol is there any brands people recommed?? I want something comfy and soft.