Ive seen both in action.
1. nasa/g&g
- has a taller, more stable stand
- appears to output more heat thou a lot seemed to go up the sides of the kettle
- lacks a wind cover thingy ie on a windy day expect frequent flameouts
- the screw in gas valve appeared to be somewhat fragile & got very hot
- made in china
- may need a copper gas extension due to heat at valve (depends how risky u think)
2. gameco "wok style burner"
- smaller enclosed bowl type stand
- flame was not quite as generous as 1 but more blue
- good wind cover from bowl
- has a pilot light
- made in hong kong/china ?
- much better build quality. gas valve/control is much more solid than 1.
- better control of flame. valve doesnt not get as hot as 1.
- www.auscrown.com has details
- i have the one ring burner but a 2 ring is available
- gameco in sydney are very friendly to homebrewers & will demo their stuff.
- gameco dont advertise widely but rely on word of mouth
3. both
- both have same gas type fittings.
- both will burn the paint off their stands & you probably should do this before brewing !
- similar price, about $110 for burner & hp reg
- both burners can be unscrewed from their stands
- if using a keg, the chime will probably have a larger diameter than both. may need some external stand for reasonable flame. a flat kettle should be ok
if you want some pics, i might be able to get some on weekend, if i get time to brew
cheers