I think there is a best medium and it's CD. IF all the same effort was taken to transfer the remaster to CD, as it is with vinyl, then the CD would sound the same as that vinyl remaster, but then better, due to better S/N ratio and lower noise floor, CD having better dynamic range, perfect pitch stability and no surface noise, which vinyl lovers 'don't mind' apparently. Weird.
The vinyl version can sound better than the CD version, if the remaster to CD is ruined and compressed.
All things being equal, with regards to the remastering process, vinyl can't sound as good as CD, but CD can always sound the same as vinyl, good or bad. The resolution and all the other tech specs are better with CD.
The potential of CD is still wasted these days, with poor remasters and lack of thought as to how this will sound on a high resolution format, such as CD. A perfect remaster to CD, will sound better than one to vinyl. CD is regarded as inferior to vinyl by many audio engineers and they think only vinyl lovers will care about sound quality. A brand new, high res studio recording, carefully mastered and transferred to CD will sound amazing.