I've always been curious about those stories of Tex and Zagor.
They are apparently grounded comics, and then magicians and monsters appear, especially with the second, who goes after zombies, aliens, robots and more.
Yeah, it is just like how Armor said. Tex is really grounded. 95% of the stories are incredibly realistic, aside from how physically imposing (and inhumanly skilled) some characters are, and even then, it's usually quite tame. Tex, the character, is quite notable in-universe exactly because of how inhumanly skilled he is. Supernatural forces exist, but they are usually treated as incredibly obscure and thaumaturgic in functionality, and mostly limited to illusionism, hypnosis, alchemy and manipulation of emotions. There are some monsters and anachronisms, but again, they are very rare (Except for dinosaurs, Tex has fought against them twice. But c'mon, who
doesn't want dinos in their western?).
Zagor however... Isn't. Granted, he still has quite a fair share of more realistic stories, about 40% of the stories are realistic, I'd say. But Zagor is chock-full of magic, high-tech stuff and the like. Not common enough to be known to most people, but Zagor lives in such a way that he keeps finding such things quite commonly. One of the most remarkable stories was when he, along 8 heroes from several other stories (even when they were only side characters) united in a magical journey to another plane, to fight several evil manifestations of otherwise good entities of the traditional native folklore, and Zagor ends up fighting Wendigo, the concept of evil incarnate. Surprisingly, Wendigo was quite weak for a Zagor villain. Hellingen however had some absurd feats, like warping the reality of the universe to a minor degree, breaking the moon and rebuilding it, and generally distorting reality and causality. Zagor still PAUNCHed him.
A good example I like to give when comparing the two is that a crossover between them is impossible. They live in different ages, and it is easy to imagine Zagor going on a time machine or something to meet Tex, but such a thing is impossible in Tex's universe.
Another example is that Tex, once, when incredibly motivated, managed to grab someone by the leg and spun them over his head, slamming them on the ground. Zagor did that too. But with a KANGAROO. And he was just playing with the kangaroo. And the kangaroo was a boxer, too.
