While I do have many sets in many sports, I have always been a team and player collector. You can see my teams in my signature below. As for my player collections, I'll only get into why I collect one or 2 of them in each sport.
First off is the Ozzie Smith collection: He is the true reason I started collecting cards in the beginning. My father was a Cardinals fan and I started watching games with him as a child in the mid-80's. Ozzie's backflips into position excited me as a child and when I was finally able to get my own packs and cards, Ozzie is who I wanted. He was the first person where I ever owned 100 total cards, as well as 200, 300, 400 and 500. Ozzie Smith cards are still my largest non-NASCAR single person collection.
As for football, I was a senior in high school before the Carolina Panthers played their 1st NFL game. Before that, I liked the 49ers and Packers. I had to drop the Niners when the Panthers ended up in the same division. I had to go with my home state team and can't root for 2 teams in the same division. I do still collect Jerry Rice, but it's not a big collection. I picked up the Patriots as my #3 team because their uniforms were just terrible back then, but really got more interested when they drafted Drew Bledsoe. My biggest player collections in the NFL would be DeAngelo Williams (RB for the Panthers for over a decade) and Steve Smith (WR for the Panthers for about 15 years), along with Brett Favre and Drew Bledsoe. I don't think anyone has passed 300 cards yet but they are all getting close.
NASCAR has been my main focus in cards for the past 15 years, while still collecting MLB and NFL cards. Mark Martin was my driver as a child. He was the first person to pass Ozzie Smith in my player card collection and that was around 2008 or so. But in the early 2000's, I was sure that Mark would retire soon and started looking for a new driver to collect. I was really impressed by Jimmie Johnson in his rookie season. So I started collecting him too. Not long after Martin passed Ozzie in my collection, Jimmie passed them both and has been the largest player collection ever since then. I added Jeff Gordon as a PC too since he was half-owner of Jimmie's car. With a couple of massive racing card acquisitions and several monster trades here, Gordon has also passed Ozzie and now Ricky Rudd has passed him too. I collected Rudd a little bit during his career as the Tide car was iconic to me in my youth.
In total cards, Davey Allison MIGHT be #1 overall, but I'm not counting it. I have thousands of copies of cards from the 20-card 1992 Texaco set. I found almost 300 packs of these a few years ago and busted them all chasing the AU card that I didn't find. I haven't added all the duplicates to this site or my PC count for him. I have at least 32 complete sets and I think I have at least 80 copies of 1 specific card in that set. I still have 301 different cards of him without counting all of those (or any other duplicates), which is pretty good for someone that really only had cards made from 1988 to 1993. The #1 WANT in my NASCAR collection is an AU card of Davey!!! Extremely rare since he died in 1992, but he is the last of the 16 drivers that I collect where I don't have a certified AU card.
I'll stop there instead of getting into basketball. I mostly stopped collecting those cards when the Hornets moved to New Orleans. I do still collect about 8 former NBA players, but the collections are no more than 100 cards each. Actually, I think every single one is in the HOF now.
NO PWE's EVER!!! PLZ PM me 1st before sending any offer. ONLY selling cards as of March 2024. No trades or purchases right now.
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Largest total PC card collections by Team, then Athlete (as of 3/22/24):
STL Cardinals (MLB) - 8810; Carolina Panthers - 2888; GB Packers - 1790+ cards
Mark Martin (NASCAR) - 2038 cards; Jimmie Johnson (NASCAR) - 1875 cards; Jeff Gordon (NASCAR) - 1594; Ricky Rudd (NASCAR) - 839; Ozzie Smith (MLB) - 707