In terms of underrated, nothing approaches T202.
In REA's last auction, I won this lot for $270 inc. BP:
https://bid.robertedwardauctions.com...?itemid=109355
Eddie Collins on an end panel, "Collins easily Safe" period action photograph in the center, and on the back, not one but 2 interesting biography summaries of Collins and his quick rise to fame. Also a side panel and bio of teammate Danny Murphy. Oh yes, graded SGC 5.
What other contemporary Collins card in the SGC 3 to 5 range can be had for anywhere near that price? Let alone, a card where you get, essentially, 2 Eddies: A T205- like color image, plus a black and white action shot.
If you sit down with a stack of T202s and read the backs, you can learn quite a bit about the players, and the deadball era in general. If you do the same with T206, you'll learn nothing except the names of tobacco products from that era.