Well I use both.I use the titanium for day and weekends when I'm walking and the heavier aluminium ones (heavier by about 10g) for base camping.
The titanium one is lighter but you don't really notice it,it cools quicker than aluminium so you can drink hot drinks that much quicker(about 2-3 minutes quicker).
So for something that can cost 10 times the price of aluminium you're not gaining any real advantage.
If you lose a £10 aluminium pot it's no big deal compared to losing a £50 titanium pot,by lose I mean lose or have crushed or broken.
If you're using it regularly and it's going to be knocked about I'd go for aluminium as it's cheaper to replace.
The reason I got the titanium was for the weight saving,I have all my metalware in titanium now apart from my honey stove and tatonka burner,all my gear now is extremely light but hard wearing,unfortunately it's also very expensive.
If you really want to save weight then you should look at your bergan,basha,dossbag and bivi.
If you want pots that are light , hardwearing and cheap to replace I'd go for aluminium every time.