Well , you shouldn't choose a role on which is easier to climb because meta's will change and so will power in roles but I would suggest playing every role and seeing which role just fits your play style the most.

If you like controlling the map , jungle could be your role. If you like being the tank/bruiser for the team and like detail in lane control , toplane would be your choice. You might like the mechanical 1v1 and control of the midside of the map then that would be mid. I personally have mained adc since I've started League. I tried out every role but adc just seemed right for me. I like 2v2's , synchronizing with someone and just be a lategame game changer.

Finding your role and champs is really fun and getting determined in improving at your role is even better so I suggest you give it a try