Actually I broke my thumb nail after almost 6 years now of practicing ,so I began to practice with my thumb flesh which was really difficult for a week. Now after 45 days I'm satisfied with the results :
1. I couldn't play without thumb nail then ,I can do with both now.
2. The bass was so weak then, it's strong with both now.
3. I've made up with D'addario bass strings after 6 years.
I think the best situation is to be able to play with both. So enjoy your playing with different techniques and colors.