It absolutely does matter. I've let guys fuck me just because they have a big cock even though they weren't otherwise my type. I'm getting a lil horny thinking how promiscuous that is of me. Show me your big cock and you'll get me going before I look up to see your face.
But I've also given guys with a big cock a chance and they couldn't use it. Somehow if you have a big cock you're expected to also have experience but that's so damaging because then you will always have this feeling of being inadequate because people expect you to know how to use it just because it's big. Learning how to use it comes with experience and feedback and most people don't know how to give feedback (let alone take it!). So everyone acts like they should know how to use it by now but nobody says what exactly should they know.
Bigger cocks feel different, you feel full and stretched and shows the guy is really taking control of you and making you work to take it in.
But smaller ones are fun too, they just poke you inside and there's more wiggle room to poke the right spot, do bigger movements etc. Big ones is just fun to take them in and feel the fullness inside and what a champ you are by achieving it. I often have to squeeze my ass to feel it pressed against my prostate because it's too big to poke me there on its own.