Which Cavalry work well on the battlefield?

My first thought is Protectorate. They have 2 different cavalery units, Vengers are solid and Daughters Flamebringers are phenomenal.
Some example battle reports:
druidsdice.blogspot.com/2017/05/battle-report-100-vindictus-exemplar.html
There is more on this blog.

Khador could be fun with Vlad3, double Uhlans and War wagon. But not sure about play-ability. They have some light cav too.

I play Legion and Raptors are great unit. Good at ragne and in melee. Many casters like to take one unit, mostly ones with occultation. They are also great under Fyanna2. Double raptors bulids could be viable but rather not optimal.

I would also consider Cryx. Soul hunters have some uses and Bane Riders got buffed via Bane CID, but we don't have the final rules yet.

Edited my "fenomenal" fail

I mean he called them "fenomal," I'm pretty sure he means he likes them. 17pts you get good damage, speeds, and mobility from all their rules.

Oh, sure, he likes them.  My point was calling them 'phenomenal' (and I had to look that up, whydak) is not giving them enough credit.  They are stupendously, phenomenally awesome.  For all of the reasons whydak described above.

Blazers are good as well as stormlances. They just tend to be forgotten because of how good the lances are.

You can actually make a pretty good all cav list with Stryker3.

Beyond Cygnar there is also the protectorate which can do a solid all cav list using Kreoss3 with 2x vengers and a unit of flame bringers.
The makeda2 double ferox list is just gross in how good it is.
In Khador there is Vlad3 with double uhlans under the iron fang theme list.
I'm sure there's a decent list hiding somewhere in trolls under the blood of heroes theme with the toughalos
In legion you can get a decent skirmishing list in ravens with their raptors
Circle can (and i stress the word CAN there) get some mileage out of wolfriders under Una2 or Baldur1. Use the tharn theme to get some free points and snacking on beasts while you're at it.
Cryx cav are workable in a variety of lists but I can't think of any off the top of my head.

Cav to avoid:
Destors ... unless you're into flow charts
Mist riders are too expensive and just add more infantry clearing to a faction that already excels at it.
Maybe add wolfriders and Bane cav here too.

Retribution Destors aren't terrible, but they're very frustrating to use. I played with them a lot in MKII and bizarrely I think they got worse in the transition, as they're worse at shooting now but marginally better at melee - but they're also worse at melee because they lost Unyielding. Ugh. Anyway, they're probably best with Vyros2 because of Veteran Leader, or maybe Issyria. I take them because I love the models but the rules are such a confusing mess I always miss out on attacks.

Mercenary Steelhead Cavalry are awful, except with Damiano. They don't do nearly enough damage and the lack of 2" melee range really hurts them. Individually they hit hard, but it's all but impossible to get more than two of them on a target and in flank range. On a charge you'll typically get one in base-to-base with the target and one at 1" range - only three attacks with Flank which isn't enough to seriously threaten a hard target. In MK II you could easily get three of them on a target and get 6 Flank attacks. Damiano helps them immensely with Money Shot and Deadeye, and his feat is fantastic on them as well. In MK II they were one of the best units in the game while in MK III they're one of the worst.