Best is very subjective at times, especially in this since you're looking at weight and performance.
For me, performance is always number one and weight honestly not even a thought. It's different for other people though. That being said though everybody is going to have their opinion on what is the 'best' combination.
If you want a ninja, get a ninja. If you're looking at GA have you considered purchasing just the GA cylinder and installing an ultralite ninja reg?