Options for flying Singapore airlines lounge access from Melbourne?

Options for flying Singapore airlines lounge access from Melbourne? I'm flying business class from Melbourne and am velocity gold. Have previously used the Singapore lounge and was a little underwhelmed. Am I able to use the Air NZ lounge? Is this a better option? Also interested in thoughts on the United lounge and any other lounge options I may have?

Firstly loose the United Lounge option.  If you thought Singapore's Business lounge was underwhelming, then strap yourself in for the (not-so) United experience...

You can use either the SQ or NZ lounges. I have used both multiple times and while they are quite different, I think the SQ lounge is slightly better as its much newer. Neither are brilliant.