Fuji not the only company that makes good guides. Pac Bay, Forecast,
American Tackle, H&H, Perfection, Aftco among others are also in the market.

Easy test for guides, take yourself a piece of 6 to 10 lb test mono with you
when you step into the store. Run it thru a guide on the rod you like and
saw it back and forth quickly under a little tension, you will soon see
which guides are superior.

If it's not important than why did they invent the roller guide?

Don't expect the stainless/titanium ring guide to take to many line passes
thru it until the line melts flat or breaks.

Hardloy, Aluminum Oxide is the same basic stuff, it got us away from the
above guides over 30 years ago.

Alconite is a Zirconia material and stronger and better heat disipation, a
little slicker, and if you notice the inside diameter for each sized ring is
a little larger than Hardloy guides. This is because the material is more
reliable and stronger the Hardloy so they don't have to use as much. The
ring to stainless guide attachment is also better on this guide.

SiC is good stuff, bring a lunch if you do the guide /line test it will take
a lot of work and may never break, due to much better heat disipation.
qualities. The titanium, not titanium finished, guides are lighter and
stronger and extremely corrosion resistant. You won't see them soon on a
Wally World rod. About a $100 plus a set for a longer rod.

You forgot Cermet, got $25 plus a guide?