What is the advantage to omega thrawns basic?

If you omega thrawns basic the enemies get stunned instead of applying the speed up into ability block. So this prevents you from chaining speed up into ability block on toons who have ability block currently on them. Thus you cannot lock out opponents with back to back ability block (his basic can get used a lot on counter attacks).

My question is what is the advantage to omega ing his basic? It seems better to leave it at 7 to potentially keep inflicting back to back ability block.

Please close this thread. Thanks.