The question, "What tire should I use in Morocco?" is kind've pointless without more information. Tire choice for Spain and Morocco is exactly the same as tire choice anywhere else, which is to say, it depends on where, how and what you're riding: on road, off road, pavement, gravel, hard-charging or mellow, heavily-loaded or not, etc. Why would it be any different?
TKC's are good tires, and they're fine on pavement, but they sure wear quickly. If you use them on an extended tour through Morocco and Spain, you'll proabably need to change them out before you're done touring anyway.
I use them when I'm expecting to be off the pavement a lot, but have taken to pairing a TKC front with Kenda 270's on the back just because this combination can last 10k+ miles instead of 4k. On the other hand, in Morocco I used Pirelli Scorpions because that's what was on my bike at the time, and this worked fine for me. Loaded up, I don't spend much time on very rough terrain, so tire choice doesn't usually make much difference. I doubt you'll be straying far afield on your Transalp.
I found it fairly easy to find whatever tires I needed in southern Spain, but I wasn't being terribly picky. Morocco would've been more difficult.
Hope that helps.