These are some of my all-time favorite products that stand out, and I've opened one of pretty much everything from the 90s to now in my years in the hobby.
1) 2002-03 Between the Pipes. ITG took what was great about 2001-02's edition and added parallels, rookies, autograph hits, and thus, some more value to each break than the inaugural release had, which only had one hit per box (excluding the masks of course).
2) 1998-99 Bowman's Best. Stunning, high quality cards with refractors, atomic refractors, and autographs of legit stars (and some lesser names), this was a great break.
3) 2009-10 Between the Pipes. There has never been a more overloaded product produced in ITG's history. Averaging 2 autos and 2 game used a box, it was not uncommon to get boxes featuring 4 and 4 and the checklist was expansive and the memorabilia huuuge.
4) 2006-07 Parkhurst. A set focused on legends of the game and not the overused rookie class? Amazing. 4 autographs per box at an affordable price point at the time was mucho bueno.
5) 2014-15 Upper Deck Ultimate Collection. The only year of Upper Deck's Ultimate that I ever felt I got value out of while opening. The hits were exciting and diverse and again, used a nice mix of veterans and rookies. I feel all of the newer additions have been too top-heavy with the rookies, 80% of whom end up out of the NHL within 2-3 seasons on average.
6) 2008-09 Upper Deck Artifacts. The product that reset my interest in the hobby because of how loaded the boxes were and how nice the cards looked.
7) 2013-14 Fleer Showcase. So many hits per box, plus the beloved PMGs, and unlike 2014-15 which was overloaded with redemptions, this was more complete because cards were mostly live in it.
8) 2004-05 ITG Franchises (all of their variations). I am always behind a product celebrating the heritage of the game and boasting large game used and autograph checklists of not just big names, but lesser names from the past.
9) 2015-16 Leaf ITG Stickwork. Another loaded product with amazing designs. I made profit with every box break of it I ever did, which is unheard of in most box breaks.
Way too many honorable mentions to list.