If we only look at syntax, use base certainly makes more sense. Perl classes appear as packages any way. You use packages, and you should use (base) classes in the same way. @ISA does not make sense at all. Why should something look like normal assignment be used to load modules? You simply cannot feel that - it has to be something that you can feel.
Perl OO is a hack, so it is bad, but still it is a better idea to use OO in Perl. It does add the taste. However I never use inheritance in Perl, as I don't want to over-drive Perl's OO.
Complicated inheritance only makes sense when it is supported all the way and clean.
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