I think there is a third option that we should consider- treat the cells as 10x10 and remake all of the icons smaller.
Then, our dragons will not need resizing by anyones standards.
Just joking with ya.
(Of course)
I'm really okay with either, but I like the first one best. But, that makes the field of combat 300' by 300'. You would never be out of range of bows and crossbows (and firearms for those using them), I'm not too sure about other missile weapons off the top of my head. At higher levels, some spell effects would be able to hit everything on the field of combat for good or ill.
Following this logic leads me to wanting to use the second option.
We've already discussed how a square on the map does not equal a 48x48 icon though. So, if the combat map is scaled so that an icon is more or less 6 feet tall (I think it might actually be scaled so that they are 3'x3' - but I also think that CocoaSpud didn't try and scale them at all), then this type of logic seems to dictate that we look back to the first option.
So, the real question then becomes, which one is less work to achieve, b/c I do agree that we should be consistent. Whichever one seems the easiest to do now, is the one we should do and that will be the standard from here on out.
Note: I was excited when I first saw this topic b/c I though it was Spelljammer related, you know, like Realmspace, or Greyspace.