Sorry to waking this one up again

But, is boosting in instances significantly faster than questing?

Reason I'm asking is that I do want 5 man teams leveled, but if boosting 4 and then granting / moving the 5th up is alot faster - That would be potentially better - Just need to do the maths what's cheaper, upgrading accounts or moving toons over (my 4 'slave' accounts atm only have 1 toon each as I said - So might be cheaper to upgrade...)