Ali or steel stage tanks question - perhaps a bit boring, but I'm confused.

I'm a bit flumoxed on the Ali versus steel question for stage tanks,
perhaps someone can help, thought perhaps at the risk of stiring up a
big debate. The DIRistas (from whom I've learned a lot, it must be
said), and the (excellent) www.bitz.fsnet.co.uk are all pretty adament
that Ali's the thing, due to more desirable bouyancy characteristics.
However, I'm still unconvinced and don't want to lug an extra 2 or 3
kilos up a ladder unless there's really a very good reason, and they're
less robust. Perhaps Yankee tanks aren't the same weight, which would
explain my confusion with the "official" line.

So here's the figures from go-dive's website ():
Luxfer ali tank 7l 9.8kg, (buoyancy stated as +1.87kg empty)
Faber steel 7l - 8kg (presumably empty?)

but Ali tank "should" be perhaps 1.1 kg light empty, and 0.7kg heavy
full
though if Ali was actually 8.8, then 1.8 bouyancy empty and 0 full
sounds plausible

and steel "should" be 0.3 light empty, and 1.5 heavy full.

Either way, 7l air @ 232 bar = 1.9kg, so I'd need an extra block of
lead with the Ali cylinder, + the extra 0.8 (or 1.8kg) of the cylinder
itself, so I'm best part of 3kg heavier climbing the ladder. Whichever
way you look at it, it's going to vary by 1.8kg full to empty, but
otherwise isn't it just more or less lead somewhere else. I guess the
Ali is nearer neutral when full at least, so I imagine the idea is it's
less of a nuisance in the water, at least when it's full.

As it stands I shall probably buy a steel one, which all my diving gang
use. Will I be going wrong, or at least, is it badly wrong? Or am I
doing the the classic beginner thing of worrying about stuff that makes
little difference?

Thanks

Hywel