32 GB is more than enough.. have you verified it has a compass?
And while the Surface Pro might be faster and all that, it's not well suited for amateur astronomy..
The are no iPads with OLED/AMOLED screens.
It's definitely not well suited to hand-held astronomy or for climbing ladders, that's for certain. And it may be a tablet, but Windows is rubbish as a tablet. It works well with BlueStacks to run SS6 and other Android apps, and I really like being able to type with a real keyboard when I'm taking notes. It's been really nice for dabbling in EAA though when I'm using SharpCap, or for imaging the planets with FireCapture. I hide it away on a conductors music stand inside one of those black cloth storage boxes that you put on bookshelves.
Just like with most telescopes, the right tool for the job.