You're essentially trading raw CPU horsepower and of course a fair bit of GPU muscle to hit the cheaper price point, while still spending in the two-grand tier. As for how the processors compare between the two configurations, here's a look at the speds...
- Core i5-8350U: 4 cores / 8 threads, 1.7GHz to 3.6GHz, 6MB cache, 15W TDP
- Core i7-8650U: 4 cores / 8 threads, 1.9GHz to 4.2GHz, 8MB cache, 25W TDP
Dropping down to integrated graphics is the bigger blow, unless you don't plan on doing anything GPU intensive, like playing games or certain content creation chores. In that case, it's a savings of $200 for a premium 2-in-1 in the 15-inch space.
To be clear, the Surface Book 2 is not a gaming laptop. However, the $2,199 configuration certainly has the hardware to play games at 1080p. If you need graphics horsepower, the more expensive configuration is still the way to go.
Hit in the link in the Via field below to check the Surface Book 2 out and/or to play with different configuration options.