I don't know the actual difference in size between the various sizes, so I can't answer that directly. But I can say I've loved every Seagull guitar I've played - they are very well made.i recently bought a Seagull Artist Mosiac, as is was a 1/3 of the price of martin 00018, Taylor 512ec
solid mahagony back and sides,cedar top
size difference Seagull is 1/2" wider between back to front thickness, 1" wider body
my main question, would this slight difference really make an impact?