I decided to be more specific, so here comes my second post for this thread:

1. Masteron is the less toxic,

2. Masteron doesn't dry up joints, hence you are much less likely to experience a joint injury,

3. Masteron does the job better at higher BF%,

4. Masteron is often less painful to deal with, especially regarding the PIP.

The only downside of Masteron would be possible prostate issues, which is why prostate examination during and post cycle is a necessity IMO.