At the Vaishnav conference at Vraj in Pennsylvania held in June-July 2009, Pujya Pad Goswami 108 Shri Mathureshwar Maharajshri (Surat-Vadodara) mentioned that Pushtimarg is the best amongst all the Vaishnav denominations.

He further went on to explain that the other denominations as propounded by Shri Adi Shankaracharya, Shri Ramanujacharya, Shri Nimbarakcharya and Shri Madhavacharya glorified the vibhuti swaroop of Shri Krishna whereas Pushtimarg did not.

Could anyone please explain in detail what exactly he meant by that?

yes.as mention by shri mathuresbawashri ,,allacharya such as sankracharya etc could not  purna form of shri krushna that is actual form of krushna .purnanad form lord shri krishna.for e g one person is millionare.than his servant can help u in gaining some rupees through what ever power he is having but not all money all such acharya are such servant which can help u in gaining not of parmanand not purnanand this kind of happiness is countable which die with this life as mhahprabuji say in shrikrishnashray " prakruta sakladeva ghanitanandkam bruhata  ,purnanandoharitasmat  krushna ava ghatiramam"

which mean all dev aspect shrigopijan-vallabh which shri mahaprabhuji ask us to worship is depend on nature so we are very v....e..r..y luckier so do bhagvat seva ,donot eat asamarpit,do not do anyashray and leave life  as shrivallabh advise

jai shri krushna