Tarantulas our obviously more popular.
I don't know much about htem though.

Scorpions ont he other hand, I love them.
Most people would recommend you an emperor scorpion.
I would too, but they dig and hide to wait for animals to pass by.

Smaller scorpions like bark scorpions you can keep them on bark shards and they would be visible most of the time. They forage at night and they sting their prey unlike bigger clawed cousins.