It depends. Some may chuckle at this but I have never been with a “guy”. But I have been with shemale Tops. I have also had many a strapon used on me. Great thing about strapons is you can experiment with size to get the right one for the moment. Continuing to increase the size can also be exciting.
With that said, the real thing feels different and takes it to the next level. Size can influence this but nothing beats the real thing.