the sides you get from beastdrol will be much harsher than the sides from diesel bro... if you don't feel you can handle the sides, you should go with diesel... transaderm is always good to run alongside beast to help with some of the sides... and for extra gains! trust me, either choice is a good choice...
if you run transaderm with beast you can achieve at least two great things... you can combat some of the sides and add to the already extreme gains... its really a no brainer to add it to it...