B737 or A320 type rating to work in Europe
 

Which one is the best to find a job : A320 or B737 TR ?

thanks for advice .

That’s an almost impossible question to answer.
Make a list of every European based airline where you could potentially be hired.
Probably an equal amount for either type.

If you are required to pay for a type rating, wait until you have a concrete job offer. Vague promises can prove very expensive, when that hoped for job simply evaporates, having completed the type rating.....
Be careful.

I think it's the better solution, wait a job offer.
I think Airlines prefer when they propose their own partner for Type Rating when they propose a job to someone.