A 20D and 90D are the classic lenses that most clinics carry, and are all that you need
+/- 28D if thinking about retina or peds.
The Super66 is a nice lens that is similar to a 78D, but you shouldn't get these over a 90D (or DWF) since you will need to do many nondilated exams in comp/cornea/glaucoma.
I personally don't like the DWF because the working distance is very close and the lenses get really dirty after every exam with patients' lashes/blepharitis
I like the 20D over the fancier panretinal (too big, nose gets in the way) and "digital" lenses (the coating comes off quickly and you get more glare)
Fancier lenses are fine, but that's not what makes a good ophthalmologist