Personally, you need to mount your Lord on something. They're expensive as hell, and you'll need the points to send them somewhere.
There are many ways you can do it.
If you're opting for a Lord on Dragon, you really only need to make 3 Choices - which Mark.
The Mark of Slaanesh is completely useless. You're on a Terror Causing Creature - so that rules out 2 out of its 3 Effects. So that leaves Panic. Now, you are subject to Panic when you lose 25% of your Casualties in Shooting/Magic. To be at that stage, you're going to be on Foot, so Panicking won't matter, and you've still got Leadership 9 to Pass the test/Rally on, or you're a Dragon. Who really couldn't give a fudge.
Nope, this leaves you with the choices between Mark of Nurgle, Tzeentch, and Khorne.
I like Khorne, so I'll start with that. It's benefits include Immune to Psychology, and +1 Attack. Sounds like a Nice Combo. Charge Whatever you want, and you gain an additional attack. However, it's not all a bed of roses. You lose out on the Benefits of Immune to Psychology, mainly because you're for all intents and purposes, mostly already immune to most Psychology effects. Also, it removes some of the Flexibility of a Flying Monster - they can't Flee if they need to. Also, a Dragon Adds in half a dozen more Str 6 Attacks. Does an additional Attack really mean that much? Personally, a Khornate Lord on Dragon Doesn't work for me.
Lords of Nurgle are pretty good on a Dragon. The Mark gives them the ability to be harder to hit in Close Combat and at Range. However, the -1 to hit in Shooting is offset for several reasons. For small arms fire and Bolt Throwers, you're on a Large Target, so there is no benefit (or penalty). For War Machines, like Cannons, which are typical Monster Killers, you don't need to Roll to Hit in Any Case. In Melee, the benefit really shows, against WS4 units. You're WS8. That means you're getting hit on 4's. But wait! -1WS reduces them to WS3 - that means that they're hitting on 5's. 1/6 less hits coming towards you, which when combined with your High number of Strong Attacks, are going to not happen that often. So not that Beneficial. It works well against any WS6 units, and is good if you're going Character hunting, although the Lack of WS8+ Characters is obvious, the benefit to your Dragon hitting their Monstrous Mounts on 3's is a huge Plus. It's win some, lose some, but is generally better than the Mark of Khorne.
The Daddy of Marks, now. Mark of Tzeentch. This is your Dream, for when you're on a Dragon. You've got a Wide Variety of Items that increase your Defenses. For example, Immunity to Poison, Killing Blow, Regeneration, 3+ Armour Save and a 6+ Ward Save, is all available to you, and that leaves you with 35points left to get a Magic Weapon - as in the Rending Sword, which almost guarantees 5 wounds a turn, or turn into a Pseudo Mage, casting Hand of Death on a 4+ every turn! However, Sorceror Lords are far, far, better. I'll put up a list with my Favourite Sorceror Set up if you like? Have a look over at the Fantasy Army Lists.
I'll give you some help with getting a set up if you want.
But as a rider, one the big babies are out of your system, the Exalted Champions are much more viable options.
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