At the end of the day, there is no global right/better nor wrong/worst version - thus no one can determin how it can/should and can't/should not be done as such a decision (if it exists) lies in the hands of those for whom the song is being performed for. So ... if playing for a jazz crowd (for an example), then doing the funky / arranger version may probably cut it ... just as if playing for an up-beat latin crowd, the 'choir' /mellow/laid back version may easily be frowned upon as well.