T-bol is milder and more anabolic. Think of a 20 mg tab of t-bol as similar to 5 mgs of d-bol, 5 mgs of winstrol and 10 mgs of var. LOL That's a pretty arbitrary equation but I's say it's close.
100 mgs is a pretty whopping dosage. That's gonna strain your liver.
For size and strength, nothing beats d-bol mg per mg.