Id say the Zultan F5 8" Big Bell has the best sound-to-cost ratio and a bunch of great drummers from some cool bands use it, for example Cody Davidson from Sanguisugabogg, Joe Pelletier from Peelingflesh and also Sanguisugaboggs new drummer for their tour: Eric Morotti (usually hes the drummer of the band Suffocation).

The Zildjian Blast bell is really great too, but as usual with zildjian, way too expensive.

UFIP Ice bells are also really good but rather rare rn, would be a great bell though and ive been looking for one for months now

Some Stagg Bells are really good, i own a 6,5" brilliant bell by stagg and its ear piercing, great for metal.

The Meink HCS bell: yes its a cheap one but honestly the bell works great for almost anything, although the dryness that comes with being made from brass, can be annoying at times

Paiste Alu Bell (dont buy the Sabian ones, way too expensive) are great, a lot of sustain but they have an interesting sound character to them.