***** NOT A TEACHER *****
(1) I think that some experts feel that the gerund is "warmer" and "more emotional."
(a) Wow! It's so nice being with you today.
(2) Some experts feel the infintive is "colder" and more "matter-of-fact."
(a) It is nice to be with you today.
(3) Which one do you think is "warmer"?
(a) Well, it was nice to see you again after all these years. Goodbye.
(b) Wow! It was great seeing you again. Let's meet for lunch soon. OK?
Student or Learner