Analog film photography and cameras

I have a couple of images of my own that I want to get large prints of so I can put them on the wall, I've got a coupes of questions about this...

Assuming the image is shot on a fine grain colour print film (ektar 100) with a sharp lens and no camera shake what's the biggest print I can expect to get from a 35mm neg.

Secondly I was wondering what the best way to do this would be?
Traditional printing or getting a high res scan and using software like perfect size and getting a digital print done?

Cheers in advance.
.

Small is good