Regarding game compatibility, back in the day my only Amiga was an A600 and initially its spec was a 1MB chip ram expansion and external floppy drive. . No hdd.. and out of the 300+ games I had for it only 9 older early A600 games refused to run, and even these worked if i used a relokick 1.3 disk.
Off the top of my head one of the hardest to get running was Bubble Bobble, and Fire Force being another.
These days my A600 is the following spec:
1MB Chip ram expansion (2MB Chip ram total)
4MB Kipper Fast ram expansion
Auto switching kickstart rom switcher with 1.3 and 3.1 roms
4GB CF card hdd
Gotek Floppy drive emulator.
When booting from the Gotek I can switch the rom switcher to kickstart 1.3 for the older less compatible games, and also disable the fast ram if needed for some games which don't like it.
Alternatively I can boot into workbench via the cf hd and run whdload, so best of both worlds.
If only using a Gotek, for maximum compatibility, I would recommend at least a 1MB trapdoor expansion and a copy of relocking 1.3 adf included on the Gotek, then you can boot into 1.3 when needed for older games. Or alternatively a standard A600 with a rom switcher.