A multimeter is a must have for building CNC machines and their control systems, but a scope needs more justification. It’s one of those tools that you don’t need until it’s just what you need ! I looked into handheld and bench mounted a while ago and decided I just wanted to replicate the CRO experience from many years ago, so went benchtop.
I went for the Hantek DSO 5000 series (about £200 at the time) as it looked like just the thing I was after. Luckily for me Banggood also sold that model and they sent one over for review (Ep26 on the YouTube CNC build - just fast forward past me yattering on about the controller to get to the review).

I’ve used it quite a few times and it is very nice to use for general waveform analysis with auto ranging and triggering getting straight to a clean signal. It has done everything I needed to do and has a nice large clear screen. I’m not sure if Hantek make a model with function generators built in but that is worth thinking about although you can buy them separately.

It’s almost twice the price of the handheld but there are cheaper bench mounted DSOs if you go for a lower MHz so as others have said it’s about the use case.

Hope this helps a bit.