I think Ironman is better than Captain America.
I agree. have you seen the movies? avengers ?
Yes, I am a big Marvel fan. I love all their movies. But I don't like the when Captain America make some comments on Tony Stark or the rift between them in Civil War. I am always on the Stark side.
ironman was first introduced in 1963. so long ago 
Haha! Oh yeah! I am not very much familiar with comics though. I started reading comics after becoming Marvel fan. Which is your favorite character in Marvel?
the actor who plays Tony Starks is grea
Robert Downey? Oh, yeah! He is great. He is the perfect casting for Ironman. I don't think anyone can portray that character again, unlike other superhero characters. He did all he can do with that character and I believe there's nothing left.
that cave scene in the movie was 200 ft set 
Wow! I didn't know that. I love the whole cave scene sequence. For me, the first movie Ironman was best. I watched it many times. And ofcourse Endgame is another favorite. It gave some great moments of Tony and the climax was so painful, I am still scared a little even for today. I miss Tony Stark.
Tom. cruise wanted to play iron man thank God he didn't right? 
Yes. Even I felt the same. When there are rumours about Tom Cruise doing the role, I saw some Marvel fans feeling very happy about it. But I don't think I can ever imagine another person portraying Ironman other than RDJ.