Get individual pedals. Multi effects units are just far too complicated and rarely sound better than individual pedals, unless you’re spending megabucks.
I’m currently using a Boss DD-20 delay, which has all of the classic Boss analogue and digital delays, along with some newer ones, and has the huge advantage of having 4 programmable presets. It’s brilliantly versatile, especially for the gigging guitarist.
The best chorus I’ve had is an old Ibanez SC-10. I’m not that keen on chorus but generally the older ones sound better.
Also, don’t be afraid of trying non-Boss pedals.