What are the differences between "The Outer Limits" and "The Twilight Zone"?

The Outer Limits has things that are scary and are always long. The Twilight Zone has encounters with the supernatural and are shorter.

Twilight Zone was written much better, and had many, many famous actors playing roles in their episodes. (And many unknown actors who later became famous).

TZ was in black and white, and ½ hour. OL was in color. one hour.

And TZ had Rod Serling….

Outer Limits had that very scary intro from the 1961 that beat the copycat TZ intro from 1962
Please stand by:

“There is nothing wrong with your set.”

I’ve watched a lot more Twilight Zone than I have Outer Limits, but I’d say that Twilight Zone frequently has surreal/bizarre situations that can be practically anything as long as it’s a weird tale. So it could include the things you mentioned, but often an episode reveals that the world, universe, or situation is very different from initial assumptions (by the audience and/or characters). That can involve dystopian futures, apocalyptic situations, curses, fate, afterlife, “other dimensions”, time loops, and/or the characters are actually toys or robots or whatever.

As far as I have seen and remember, The Outer Limits tend to be less surreal and more about space aliens and futuristic technology (science fiction) and situations with those elements, rather than TZ’s situations which were more frequently about other freaky universe settings.

Outer Limits had more Horror/Science Fiction.
Twilight Zone dealt more with Social Commentary/SciFi.
Of course, there was also One Step Beyond

Same thing.

Another thing is that The outer Limits is in color and The Twilight Zone is in black and white.

Correcting posts by @KRD and @elbanditoroso: The original Outer Limits from the early ‘60s was in black and white for both of its two seasons.
There was a second series in the ‘80s by that name, but since we are comparing it to the Twilight Zone, I assume the OP is referring to the original.

When I was a kid, I loved Twilight Zone but couldn’t watch Outer Limits because it scared me.

Same here @Caravanfan the Twilight zone is fun to watch but The Outer Limits are a little scary.