Difference between watercolor and oil based painting

I know there's a difference. And now I'm quite torn between the two.

I love watercolor. And recently I did painting using Procreate app and used their oil based brushes.
Stark difference.

Take a look.

I like both. But to mix them up seems a bit jarring. I don't know.

But I quite like this one. It's done in procreate. Using their oil based brush. Procreate doesn't have good watercolor brush like Tayasui Sketches. Sad.

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A photo posted by Afzainizam Zahari (@afzainizamzahari) on Sep 29, 2016 at 8:04am PDT