Smaller pix or bigger?

I've been kicking this around (since before I started this latest blog, actually), and what I'm struggling with is the size of the pix that appear when you click on the thumbnails.

There are two posts with pix currently. 1 has the larger thumbnails and larger resulting pic when you click. The second post has smaller thumbs and smaller main pix when you click.

The question is, which do you, as the reader(s) prefer?

I can tell you from an authoring standpoint, the smaller thumbnails w/smaller pix is easier for me (Because I can use Windows Live and upload a whole lotta pix at once...where as for the larger, I'm forced to do 5 at a time through Blogger's interface).

I've pretty much answered my own question, just wanting to see what you (all) thought.