The surface pro would be better for streaming. Apple products have trouble with some software programs like OBS. Your only alternative is a xsplit but that you need to pay for.

Using your surface should integrate really well with Minecraft if that’s the game you’re attempting to stream. Also not if your obs isn’t “capturing the game” you could just set your settings to capture your entire screen. I would definitely use your steepshot account attempt to stream at first. You can always change the stream settings when you feel as though you have a feel for what you’re doing.