By liquid you mean injectable? I don't know if there is a liquid oral Methandrostenolone (=Dbol) product.
I think there are injectable Methandrostenolone products on the market, though (Refrovit-B, Ganabol).
Oral Dbol is modyfied at its (postion) 17-carbon atom. This to survive the liver first pass and make it to the blood stream. This makes it liver toxic.
So if you inject Methandrostenolone, this will be "better" for your liver. Therefore, yes, injectable Dbol is better than the oral version.
However, IF you are not affrais of injections, there are much better choices than Methandrostenolone, imo. The good thing about Dbol is, that it's a well-working steroid with moderate side-effects and that you do not have to inject it.