Yale is the Z-Wave lock I recommend. Schlage makes a great lock but they haven’t done well with Z-Wave compatibility. If you search this forum you’ll find many frustrated 2GIG users who struggled getting their Schlage locks to reliably communicate with their 2GIG panel. Schlage makes a great physical lock and I would recommend them if it wasn’t for the compatibility issues.
While Schlage does have a higher ANSI grade than Yale, keep in mind that a grade 2 Yale lock is probably not the weakest link in your residential door security. The door frame is probably the weakest link. I would worry about reinforcing the door frame before worrying about grade 1 vs grade 2 locks. Disclaimer - I’m not a locksmith.
Also if you have a window in your door or near your door, even a small one, that’s a greater vulnerability than your ANSI lock grade.