I have used both seperate shampoo & conditioner, as well as
2-in-1 shampoo+conditioner...I was wondering if it is better so shampoo, then condition...or if the 2-in-1 shampoo+conditioner works just as well. Thanks!

I always use a seperate shampoo and conditioner. I've tried the 2 in ones and I didn't like them at all.

I don't know which one is like, better for your hair but I like seperate shampoo and conditioner because you can experiment with how muich you put in and you can get different results.
With 2-in-1 you don't have that option.
Just my opinion

sahmpoo and then conditioner i herd 2-in1 sets were bad and i woulnt mix the shmppo and a different conditioner only if's it's from the same brand

In my opinion, it is better to use first Shampoo, then Conditioner, not 2 in 1....

I use shampoo, then conditioner. I usually put shampoo everywhere in my hair, then conditioner at the bottom. If i put too much in, it makes my hair greasy o_O