Well, in my experience the Classic pack is the only pack that is a real bonus. Aren't the rest of the items just regular items you can find in the game? Isn't the Vault 13 Canteen and Armored Vault Suit the only unique items in the pre-order packs? That's why I got my CE from Game Stop.
Not really. All the groups get a unique piece of armor, and a unique weapon, and some stuff everyone gets. The best armor is either the Merc pack's metal armor (DT12/Wg20) or the Caravan Pack's Light Leather Armor (DT8/Wg10), the Vault 13 suit (DT8/Wg15) is still pretty viable, but it isn't "they best".
For the weapon, the Classic Pack's 10mm is probably the best because of the low weight and continued utility.
The Classic Pack also gets the canteen, which is ridiculously useful in hardcoe mode.