I have done all 3 types of weaning as my boys were all very different.
I did jar feeding but for me left me with a very fussy boy but actually think could just be him! In the carrefour and Coop here they have a wide choice of jars and powdered baby food. Nothing compared to the uk though and quite expensive.
I made my own and started with purees .. yes when you are travelling you can defrost the food. I used to take a flask with boiling water I ff so did this anyway. The moved to mash the food he had whatever we had. Was very easy cooked most things sunday in hour and had a week worth of food.
I BLW my last son so no puree's he just has what we had and from 6 mths. Very easy bit messy but lots of fun. It is another option if you dont feel the jars offer you the choice you want.
Good luck and enjoy baby weaning whatever method you choose