My personal recommendation would be to get a selection of good quality Torx bits, and a 1/4 inch socket driver. More and more fastenings use Torx and the ease of removing say all six rotor bolts with a ratchet driver compared with a single key is enlightening.
If you use HT2 BBs, then I would suggest a proper 1/2 inch drive cup style BB tool, not a c or even a ring style spanner.
Chain link pliers. Not essential, but a godsend.
Long T-handled hex keys, preferably the two ended type.
Good quality screwdrivers to fit limit screws.
Grease gun.
Cable cutters. Lifechanging!
I’m wary of toolkits, as more often than not they have stuff I don’t need, or miss some stuff that I do. I have built up a decent toolkit by buying separately. Most of the SS stuff looks good, and cracking VFM, but I also like Fat Spanner and Cyclo (bikehut)