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sintered pads (metal) offer a better bite
That's what I understood, but then I found this, which says the opposite.
Yours sincerely,
Confused of Suffolk.
Scilly.Suffolk-
That article is a little confusion since it claim resin have more bite/power than metal.
I did a quick search for similar article which said differ, MBAction said that the pads have an on/off feel that achieves maximum power quickly as the lever is applied, Merlin said that sintered offer lots of power at the ultimate top-end power, whether resin have less, lastly, here is a chart showing a good break down of each Shimano's disc pads;
Basically it's saying that resin offer better modulation, but sintered offer better power, also for those who wish to have a quieter brakes, a finned sintered mean it can cool down quicker to reduce chance of squealing due to heat build up, almost as quiet as a non-finned resin even.
Lastly (again), there is a possible reason why some people says resin is better, is that there are disc rotor that are resin-only, meaning it work best only with resin pads due to the softer material.
TL:DR; our understanding is correct, that article you posted is a wet sausage.
edscoble
The problem with such brakes as the TRP Spyres is that while it is actually easy to step up, it is also easy to not do it correctly.
It's within the realm of possibility to get it set up nicely, in some batches of the Spyres, the pads doesn't sit straight in the calipers (not uncommon with mechanical disc, BB7 suffer the same issues as well as Shimano), sometime the frame's mount isn't faced 100% to allow the pads to hit the rotor 100% straight, also you have to make sure the arm on the calipers return almost fully and the pads as close as possible to the rotor (again the same on all mechanical brakes).
TRP (and Shimano) brakes come with resin pads to enable better modulation and reduced rotor wear, however a sintered pads (metal) offer a better bite, with the increase wear in rotor and less modulation, basically more grabby.
I'm afraid I have yet to tried a sintered pads on those Shimano/TRP/etc. set up, but can't imaging why it wouldn't work better when a sintered pads on road hydraulic offer a great bite.
Personally given how cheap rotor can be, I'd be happy to compromise the expense of rotor wear for more bites.
Someone mentioned Uberbike for pads, and think have been vouched for;
https://www.uberbikecomponents.com/view-product/Uberbike-Tektro-Draco-Dorado-Orion-Auriga-Aquilia-Sintered-Disc-Brake-Pads