Hi T,
The only way you will know is to shoot for yourself and compare the results at the print sizes you wish to go to.
If you are talking about travel I assume you are looking at a Mamiya 7 or similar for film or 35mm/mf for digital.
Each of course has its pluses and minuses ranging from instant feedback, low after costs, quick turnaround, the look and film ,veracity of film, etc , etc.
There are many places her in the UK for scanning including major labs such as metro, spectrum, colour4colour,etc or individuals providing a scanning service...check out the uk lf forum for links to those who provide scanning services.
Personally I shoot on 54 color neg and drum scan for my project work because I like the look of portra 160 for my project, want the amount of rise fall I can get with this set up on all lenses, like the ability to print as large as I want and shooting on film works for me in other ways also compared to a dslr set up.
I dont mind the wait (I actually quite like the anticipation) of film processing but of course digital is more convenient in terms of time and no scanning, etc.( I shoot all my commercial work digitally so its nice to have the difference).
If I could justify the cost of a digital set up similar to my film one (tech camera such as arca rmd etc with highest end db then I would look at shooting that way)
Each chooses his own medium.
Zhang Xiao for instance has shot his 18000km of China's coastline on film whereas others might choose a 5dII for the same project.
Shoot what you feel comfortable.
Shoot what you feel is right.
Shoot what you can afford.
Marc