SilverFoxxy1

An ounce of silver is definitely not an ounce of silver, if we mean any ounce is worth the same as any other ounce. The difference in premiums refutes the equality idea. In the US, Eagles have much higher premiums than Britannias for some reason. In general, you can get spot for Eagles when selling to dealers, but not always for other coins, and certainly not for bars or rounds.
As far as the two types, it's early, but long-term I doubt it will matter much. If you were selling to new stackers a couple of years from now, they might prefer the then-current Type 2 Eagles. But it's hard to say. The Type 2 is a big disappointment because it doesn't have any noteworthy security features, which as I recall were promised. The US Mint is lazy and far behind the Royal Canadian Mint, the British Royal Mint, and even the Aussies. I would probably default to Type 2 at this point. Last I saw, the Type 1 had higher premiums or was already out of stock. I wouldn't buy either right now, since the premiums are still unusually high, but once they settle down I'd prefer the Type 2.

First, an ounce of silver is an ounce of silver. The design of a pure bullion coin should be a secondary concern. The main decision should be on the type of silver bullion (on Silver Eagle, or Britannia, or Maple Leaf, or etc. level). This should match your geographical region, it is recommended to buy the national bullion coin.
Having said that, getting a favorable design can raise the fun aspect of stacking branching out into semi collectability. But that's more of a personal than a public impact.
Personally, at the moment I would try to get some of the type 1 designs, because these will get harder to get over time, and it would be nice to have a stack of both designs.