You don't upgrade Keshiks
First of all, you don't have to upgrade manducavs either. It's your choice.
Second of all, of course you do. If you cannot clear the map relatively quickly you'll have to upgrade them to tanks eventually. There are continents maps, huge maps, quick speed and just lack of skill to never need anything but keshiks.
Thus holy keshiks and less holy CA will lose all their promotions except for logistics. Which is obviously the best of them all, but still with penalty against cities double attacking tanks are not the most magnificent thing on earth.
(You don't even upgrade Crossbowman unless they have no/hardly any promotions yet. They'll always be more useful as ranged units (with logistics, it's guaranteed 2 dmg per turn to a city of 80 or more strength.)
Thanks for the enlightenment

, but that's completely irrelevant.
It only proves my point: some units are just too good the way they are that their upgrades look bad in comparison.
All units keep their unique traits on upgrading (for e.g. Iroquis Mohawks --> Longswordmen with Forest/Jungle fight bonus.
I was talking about Chivalry UU's. Don't they all lose their special abilities upon upgrade? Had that been such important criteria, keshiks would have been the worst unit out there.
Just a few exceptions... or not sure... Madelaku may even be the only unit, that loses their unique ability. And without it they are just regular Knights anyway.
(Note: Chu-Ko-Nus for e.g. don't lose their ability, they just can't use it anymore when going from ranged to a melee unit - theor upgrade path may also change in G&K so they upgrade into a ranged unit^^)
You want to tell me that cavalry upgraded from conquistador can found a city?

And we already covered keshiks and camel archers.

The only ones I'm not sure about is siamesse elephants. Do they keep the bonus vs. mounted or become a regular cavalry vulnerable to mounted? If they don't, their upgrade is arguably even more pointless than keshiks'. And not to mention that being penalized against cities they are less powerful in offense than manducavs to begin with. And slower.
So,
JeanBaptiste, here is your answer. I was sure I voted earlier today, but since I didn't and the poll allows multiple choice, I'm going to vote for both. Keshiks and manducavs. Not b/c I think they are equally good (who am I kidding, right?

) but to make poor manducavs some justice. They don't deserve to end up at the bottom of FeiLing's list.
