I can really do not recommend T3. From my personal experience.
It makes me flat as hell, weak and lethargic.

In my opinion Clen is by far the best fatburner. Just cycle it a little bit. You will get along with the sides quickly. And, recording to Dave Palumbo, it is the only fatburner that actually burns fat. Maybe besides from DNP...

T3 also comes with several sides on libido, hair and so on...