Arm cartridge has to be more important - a mistracting cartridge can wreck the most valuable component of your system - the records.
Back in the glory days of analogue when dealers had multiple turntables/arms as a dealer I found that certain arms worked better with certain turntables. There is synergy beyond the specs. I assume complementary resonances is a big factor as there are no perfect components - hence the arguments and differing views.
So I try to find the most common arm/tt combinations people are running and then find the most common cartridges people are using with that arm. Then try and then from that group of cartridges check the reviews out. Also when you read the reviews check what speakers the reviewers are using as that will give you an idea of their preferences as well and the context of that review.
Back in the glory days of analogue when dealers had multiple turntables/arms as a dealer I found that certain arms worked better with certain turntables. There is synergy beyond the specs. I assume complementary resonances is a big factor as there are no perfect components - hence the arguments and differing views.
So I try to find the most common arm/tt combinations people are running and then find the most common cartridges people are using with that arm. Then try and then from that group of cartridges check the reviews out. Also when you read the reviews check what speakers the reviewers are using as that will give you an idea of their preferences as well and the context of that review.