Which is best for rosacea: metrogel, cream, or lotion meds?

Same active. Same active ingredient. It is dependent on your individual response and preference.
Rosacea. There are many treatment choices for rosacea depending on the severity and extent of symptoms. Available medical treatments include antibacterial washes, topical creams, antibiotic pills, lasers, pulsed-light therapies, photodynamic therapy, and isotretinoin.