Just a personal opinion mate.
In the ATR i felt you had a little bit more creative freedom so to speak
Once you get used to it , The ATR is just a big light aircraft.
With a jet you have to be more conservative.
The ATR is also a great aircraft for your first job and to learn your trade in.
If i were you and had a gauranteed job at the end of it i would certainly do the ATR TR.
You will also appreciate the Jet Job more when you get it.
Cheers