I can tell you it feels pretty good getting head from an older guy. More patient, trying to get you off instead of himself, knows what feels good, more experiences, etc.
I prefer to watch the guy who's sucking me than porn, any day. I love looking at them, in the eyes especially, because of how fantastic it feels and the emotions and sensations they're giving me and me to them. And when I cum in their mouth, I have to see them, their expression and to witness my cum being ingested into their body. A religious experience for me, pretty much.
I like sucking guys off while they watch porn. Often I can hear guys cum in the video they are watching at the same time as they spurt their load in my mouth. We both get what we want so no problems.
Str8 guys either need or pretend to need some form of str8 porn to keep them stimulated while they "let" a cocksucker feast on their cocks. My guys ask for porn, then seldom watch it! Maybe trying to reassure themselves or prove it to me that they are still str8 ?