Well, Tarns main power would be to deactivate machinery and cybertronions with his voice, but Tronus isnt machinary and has a organic body under his armor. However, Tarns ability could turn off Tronus's helmet systems. However, Tronus despite probably being smaller then Tarn, his dark matter could be a massive advantage. Tronus also has battled creatures, beings, and many more double or more the threat of Tarn.