The one on the right (A3/A4). On the back of the bottle it should say that it meets VW 502/504 spec which is the spec for modern VW/Audi petrol and diesel engines.
Regarding Longlife, we generally don't use that spec in Australia as we have shorter service intervals.
Another option (although not on sale at the moment so its quite a bit more expensive than the Castrol) is Penrite Enviro+ which actually meets a higher/newer spec for VW engines which is VW 504/507. I have used the Penrite Enviro+ for a number of years in my Mk6 R, Mk6 GTI and now an Audi SQ5 and prefer the Penrite over other brands.
Penrite Enviro+ Engine Oil - 5W-30 5 Litre | Supercheap Auto
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