Which commonly collected set is the best investment?

Right now.

Goudey
t206
Topps
Other

If we're talking value for dollar, I'd say low-mid grade Cracker Jacks are great pickups right now. I've seen some good deals recently on them. David Bryan sold off a bunch last week including several HOFers that went pretty cheap imo. And it's hard to come up with a nicer looking set than the CJ's.

Many of the mainstream caramel sets have cooled off considerably in the past few years, which probably means that it's a good time to "buy low". E sets like e90-1 or e95 could be good pickups now too I'd say.

Agree with Ben. The recent prices on the CJs seem low. A SGC 30 Tinker for just over $200 and SGC 30 commons for $40-45. (Maybe the '14s are an even better deal, as they don't cost much more than the '15s and are much harder to find.) However, when a lot number of cards hit eBay, the prices seem to drop - maybe that was the case with D. Bryan's auctions. If 20 E95s hit eBay, or any other issue for that matter, there would probably be some nice deals on a few of the cards.

I couldn't agree more in regards to Crackerjacks. I've been picking up mid grade 1914 CJ Hof's & short prints now for about 6 months.
They're currently a good buy IMO, plus they look awesome!!!!!!!
E90-1's seem way down to. Anyone looking to get involved with the set? Now is the time.

Tony A.

wish I had the money to buy. Right now, I'm more focused on paying off all my credit card debit and getting back to living on cash only like I did from 1993-2007

Jay

I'd say mid-grade Goudeys because the prices have dropped so much in the last two years.