Lore-wise eh? I'll expand my answer beyond simply "for the adorableness".
While saurus have some amazingly cool heroes, Kroq-Gar being the pinnacle of epic badassitude that all Children of the Gods should aspire to, they also have a bit of an advantage in that combat was what they were spawned for. They are the warrior caste of the Old Ones, they've been given every biological advantage that can possibly be condensed and packed into those glorious pecs of theirs. It's hard for them not to be memetic badasses when they can tank any enemy and consider being flank attacked only a mild inconvenience.
You know that the entirety of saurus are amazing when they provoke such reactions from our enemies as this famous quote:
I hate saurus. I hate them. I hate their lizard faces. I hate their clubs. I hate their sticks. I hate when the sticks are next to the clubs and I hate when the clubs are next to the sticks. I hate that Kroq-gar pulls 2280 of them out of his scaly asshole and then descends on me like a Vogon at a poetry convention.
I hate the Saurus auto-resolve meter. I hate it because it lies to me. It says I have a 50-50 chance of victory. This is patently false, because I have twenty units of skeletons who are held together with prit stik and prayer. I do not have twenty units of eight foot tall geckos constructed out of pectoral muscles and galvanised coffin nails.
I hate that they shout bok at me. Bok is the Bristol Orienteering Klub, which is completely irrelevant to a battle in Lustria and should not be shouted repeatedly while eating a rank of tier one infantry like buffalo wings.
I hate their morale. I hate that surrounding them simply prompts one of them to pull out a US general's helmet so he can make a speech about 'now we can attack in any direction'. I hate that their reaction to a devastating rear attack is to become somewhat peeved. I have looked a Saurus in his smug scaly face as an encirclement that would shatter any other early game infantry closed in.
He went from :I to >:I , killed an extra two hundred skeletons because I had foolishly allowed all four sides of the Saurus unit to fight at once and then swallowed my Liche Priest like a slim jim.
I have resolved to shoot every Saurus dead. Every Saurus. All of the Saurmen and the Saurdren too. I hate them. I no longer see battlefields because they're covered by a thick blanket of arrow trails. I hate that it barely stops them. I hate that they keep coming while shouting about the Bristol orienteering klub, or the Bank of Oklahoma or the 1983 Bok asteroid. I hate that they made me google bok so I could write down ways in which I hate things that have it as a name. Bok is also a lunar crater and a martian crater. It is also a village in Iran. The IATA code for Brookings Airport is Bok. I will never go there because it would give me palpitations.
I hate that Kroq Gar is friends with the Rare Pepe next door, who also declares war once I've shot Kroq Gar unconscious for the tenth time. He also has Saurus only these ones are blue. Somehow this is worse.
Skinks on the other hand, are first and foremost artisans and workers. Sure, they still have an advantage in combat compared to warmblooded races, but it wasn't their divinely mandated purpose. Which makes their baddasses all the more bloody impressive, because they are badasses IN SPITE of being skinks, not because of being skinks.
Tiktaq'to? The dude and his pet terradon demoralised an entire savage orc tribe by deciding to take their warboss skydiving.
Oxyotl? He John Wick'd the Realms of Chaos before John Wick was even a thing. And when he came back, he inspired the Old Ones to begin spawning Chameleon Skinks for the first time in who knows how long.
Tetto'eko? The lad is so magically powerful, I reckon that he is on par with a third-generation Slann. Certainly close enough that the slann gifted the old chap one of their lazy boys and made him an honorary slann.
Tehenhauin? Ok, I'll be honest, I don't actually like Tehenhauin that much. He rubs me the wrong way... Can't even explain why... maybe it's because he doesn't look adorable...
Skinks don't have the inherent advantage of warfare that their saurus cousins do, and yet I'll rate any of these lads with the best of the saurus. They are crafty, and they don't care if they have to fight dirty. They are badass little adorable bundles of scales.