If you're on a tight budget and you play one game for a long time switch is the way to go.

If you can spend 600-1300$ on your handheld, you should probably look into other windows based handhelds like Ayaneo Air that are as small and light as switch but can also run your steam library.

But if you think there's a chance you can overcome SD's bulkiness it's 100% the best choice out of everything for today's market