Eagles vs. Buffalos for my Gold IRA - what's the play?

• •Alright, so I’m liquidating some of my old tech stock positions and looking to move a significant chunk into my Gold IRA.
• •Been holding a good amount of physical since the early 2000s, especially after '08, but the IRA is a new focus for this particular tranche.
• •I’m heavily allocated in metals already, always have been, especially since I left the Street in '16 and decided to simplify things.

Alright, so I’m liquidating some of my old tech stock positions and looking to move a significant chunk into my Gold IRA. Been holding a good amount of physical since the early 2000s, especially after '08, but the IRA is a new focus for this particular tranche. I’m heavily allocated in metals already, always have been, especially since I left the Street in '16 and decided to simplify things. My portfolio's hovering around $3.5M right now, and I’m aiming to put another $500k into gold in the IRA.

The perpetual debate: American Gold Eagles or Gold Buffalos? I know both are IRS-approved for IRAs, which is obviously table stakes. Historically, I’ve always leaned towards Eagles for the numismatic value and wider liquidity, but the Buffalo's purity (24k vs. 22k) is a strong pull, especially with all the market uncertainty. I’m based in NYC, so pretty much any major dealer is accessible, but I'm looking for the best long-term hold here, not just what's easy to get this week.

I understand the arguments – Eagles for the copper/silver alloy for durability, Buffalos for the pure gold content. But what are people seeing in premiums right now for IRA holdings? Are the bid/ask spreads materially different for large buys? And for those who have bought and sold significant amounts of both, did you find one easier to move or with better returns net of premiums and potential taxes (outside the IRA, of course)? Just trying to get a pulse on real-world experiences beyond the typical dealer talking points.