"Best" is subjective. A really good definitition of best is, the ammo that functions the most reliably in your particular gun.
25-350 USD or so
.223 Calibre although .223 Will fit on a 5.65 mm, a 5.65 mm Will not fit in a .223 calibre chamber.
buffaloarms.com
There are various types of ammunition. There are also particular guns that use the recently developed 30 mm ammunition. Among them are aircraft guns and armoured vehicle guns.
.30 caliber.
6.8mm / .270
100-400 USD or so
If the barrel has 5.56 printed on it or you have verified with the manufacturer that ALL of their barrels are good for 5.56 ammunition.
The Ruger 9 mm Model 94 is not a commonly referenced firearm, as Ruger is better known for models like the SR9 or the P-Series in 9 mm. If you meant a different model, please clarify. The value of any firearm can vary greatly depending on factors such as condition, rarity, and market demand, typically ranging from a few hundred to over a thousand dollars. For an accurate valuation, it's best to consult recent sales data or a firearms appraiser.
7.65 = .32 ACP
ATK Small Caliber Systems is the world's leading producer of high-quality ammunition and links for the military in 5.56 mm, 7.62 mm and .50-caliber rounds.
A 30-06 in MM is a 7.62x61 round. Also considered a 30 cal.