I have a level 70 druid & 70 priest on two separate accounts. I originally quit WOW sometime after BC.

Do you guys think it would be easier and/or faster to dual box and level these characters together (70-80)? Or would soloing be my best option?

I figure I could use both to dps and priest to heal.

I'm jumping right back in and will be playing a lot. I want both toons to reach 80 by the time Cata comes out
Any thoughts or opinions? I'd appreciate it

thanks