If you were just going down to the local campground for a trial run, I'd say "Go for the Brooks". You can always take a bus home.
If you are going to put a few mountain passes between yourself and home, I think I'd reconsider breaking in the new saddle on the road.
I have a Brooks somewhere in my garage (along with some other Brand X units). It never did "Break In" to where it was comfortable. Thousands of kms later it was still and anvil. Of course that can happen with any saddle.
Like the man said"It's your ass".