Both have 6V6 power tubes. Sportsman is based on the Princeton, Skylark is based on the Harvard. Sportsman has 16 watts clean, 19 watts max, with a 'headroom' control that is more or less a MV. Skylark has 12 watts which can be attenuated. Both can do clean and grind to one degree or another. Other than the attenuator, presence control and high/low gain switch on the Skylark and slightly more headroom of the Sportsman, is there really that much difference between the two? My question might be stupid or not. I feel like the Skylark is an improved or fancier Sportsman more or less. Although, maybe there is a BIG difference between the Harvard (which I'm unfamiliar with and the Princeton). I own a Sportsman and have spent very little time with the Skylark, although I really liked what I heard. If there was a thread on this that I may have missed, please post a link to it so I can read it. If I'm beating this subject to death, let me know and I'll just delete this thread. Thanks for reading and your time.