TOSCA -
1. It is Licensed
2. Code less approach for automation
3. Dedicated customer support channel.
4. In built reporting
5. TOSCA adoption in industry market is fairly less than Selenium (Fairly new tool compared to selenium)
6. TOSCA provides testing capability for SAP testing.
Selenium :
1. It is Open Source tool
2. Coding approach for automation.
3. No dedicated customer support channel.
4. No in built reporting mechanism
5. Selenium adoption in industry market is more in comparison to TOSCA
6. Selenium lacks the capability for SAP testing.