As with most bike parts - and indeed bikes themselves, more expensive often equals better quality, although that in turn doesn't necessarily equal a better buy or a necessity for everyone. Sluggish gear changes can be down to cables rather than issues with mechs, but do you need Teflon coated cables (indeed, do sluggish gear changes matter to you)? I certainly think cables need as much consideration and attention as any other part, but whether you well-lube stainless ones, or use Teflon (or other) coated cables, is a matter of personal preference/budget.
Once a cable is 'good enough' any better is no advantage.
I use coated cables as both my bikes have BB routed cables and I believe the teflon coated ones carry less muck into the outer, supported by not having had to replace (or do anything else) to either bikes cables in 2 years, of course plain stainless may have been as good, but for the minimal cost I think I'll stick with (Jagwire) coated.
Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
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I use coated cables as both my bikes have BB routed cables and I believe the teflon coated ones carry less muck into the outer, supported by not having had to replace (or do anything else) to either bikes cables in 2 years, of course plain stainless may have been as good, but for the minimal cost I think I'll stick with (Jagwire) coated.