The one in the picture might be a male. Is the other one(or other ones?) bigger than the one in the picture?
Also, a lot of resources mention the 50-60% humidity range. I found one that said a range from one end to the other of 30% to 70% was best. If normal humidity over there is 70%, 60-70% humidity would probably be a safe range. I might consider removing the underwater heater to lower humidity.
As for the roaches, thats a matter of personal opinion. I like Dubias, but I have to admit they take a while to get the colony going. I like their temperament. They're slower than turkestan roaches, but they also grow slower and reproduce a slower. I mostly got dubias because they were locally available. One thing I don't like about them is they burrow into the substrate pretty fast.
Another difference between them is Dubias hold their eggs inside a shell-like egg sac called an oocetha that the mother carries inside her abdomen. Turkestan roaches lay eggs everywhere instead.
Turkestans don't really burrow from what I've read.
They are also called "Red Runners". Ive also heard they may have a bit less chitin than Dubias. I would say either is a great choice.