The Tomahawk is what's considered to be the Strix version of board's but under an MSI branding/badge while the Pro series is more geared towards the bottom of the barrel users. The price difference is reflected with lower tier components, cut down features(lack of a secondary M.2 heatsink) and generally a lower tier audio design(ALC1200 vs the ALC892/897) when compared to the higher tier board. Otherwise the chipset used is exactly the same.
Oh right, one of the boards only has one LAN port, the other has 2.
Which one will work better/faster?
What do you intend to do with your build? What are you looking for from your motherboard purchase? You could add racing stripes and make the frames go higher, lol, just kidding. Depending on what app's you want to use, the system should be able to handle it regardless of what board you pick