See a trend here … skip the ti axles. They aren’t worth the slight weight saving at the cost of much higher price and less strength. Ti won’t last longer and you will notice no difference is ‘smoothness’.
I ride with Time RSX carbon pedals with steel axles. The only difference between these pedals and the model witht he ti axle is 60 grams and $120 (but I bought mine on eBay for $100, so the price difference is even more pronounced).
If you like the Keos, also check out the new Time pedals. I really like mine. They have all of the benefits of the Looks with a few additional things (like adjustable Q factor).