For all practical purposes, IBrowse is the only choice for 68K. It doesn't support all modern web standards, but it does support modern encryption (slowly) and is wrapped within a very mature/stable and configurable UI. And it's actively maintained!
AWeb has not seen an update in roughly a decade. It's very obsolete at this point, but is pretty zippy as an offline HTML documentation viewer.
There's also
NetSurf, which supports (most?) modern web standards, but the 68K port is very resource intensive and still very beta. I think this has the potential to become a really good browser, but core NetSurf development is quite slow and then the 68K port requires more work on top of that. The OS4 version is very good at this point, though.
There's
another version of NetSurf based on an SDL engine that is even more resource intensive.
The final traditional Amiga browser was Voyager, but that's decades old at this point. I'm not even sure where to find it anymore.
