Both have been used as alternative names for Brisbane, I couldn't tell you if one is better than the other, seems like it's disputed:

Part of the Brisbane conurbation is located on traditional indigenous land known also as Meanjin, Meaanjin, Maganjin or Magandjin amongst other spellings.[32] There is a difference of opinion between local traditional owners over the spelling, provenance and pronunciation of indigenous names for Brisbane.[33] Tom Petrie in 1901 stated that the name Meeannjin referred to the area that Brisbane CBD now straddles. Some sources state that the name means 'place shaped as a spike' or 'the spearhead' referencing the shape of the Brisbane River along the area of the Brisbane CBD.[34][35][36][37] A contemporary Turrbal organisation has also suggested it means 'the place of the blue water lilies'.[38] Local Elder Gaja Kerry Charlton posits that Meanjin is based on a European understanding of 'spike', and that the phonetically similar Yagara name Magandjin — after the native tulipwood trees (magan) at Gardens Point — is a more accurate and appropriate Aboriginal name for Brisbane.[39]

From https://en.wikipedia.org/wiki/Brisbane#Toponymy