I did a comparison of Ripple original/unsweetened/vanilla milk, Silk soy milk original and unsweetened, and dairy 2%, skim, and whole dairy milk. I looked at sugar, carbs, sodium, fat, protein
Ripple original: 6 grams of sugar, 6 grams of carbs, 120mg sodium, 5 grams of fat, 8 grams protein
Ripple unsweetened: 0 grams sugar or carbs, 120 mg sodium, 5 grams fat, 8 grams protein
Ripple vanilla: 15 grams carbs, 15 grams sugar, 120 mg sodium, 5 grams fat, 8 grams protein
Silk original: 6 grams of sugar, 9 grams carbs, 95 mg sodium, 4.5 grams fat, 8 grams protein (interestingly has 50% B12 added)
Silk unsweetened: 1 gram sugar, 4 grams carbs, 75mg sodium, 4 grams fat, 7 grams protein (interestingly has 50% B12 added)
2% Dairy milk (used Horizon brand): 12 grams sugar, 12 grams carbs, 130 mg sodium, 5 grams fat (3 of them saturated), 8 grams protein (and 20mg cholesterol) (interestingly has 20% B12 added)
Skim milk (Horizon): 12 grams of sugar, 13 grams of carbs, 130 mg sodium, 0 fat, 8 grams protein (interestingly has 20% B12 added)
Whole Milk (Horizon): 11 grams sugar, 12 grams carbs, 120 mg sodium, 8 grams fat (5 grams saturated) (35 mg cholesterol), 8 grams protein (interestingly has 20% B12 added)
To me, it would seem that the soy milk comes out on top as far as b12, lower in sodium and fat. Soy milk and Ripple are equal in terms of carbs and sugar (except the sweetened varieties) and actually both are lower in carbs/sugar than any of the dairy milks.
For me, I have to limit soy intake due to thyroid issues, so Ripple is a viable option as an equal alternative to soy milk, but yes, cost is a prohibitive factor for me, as well as having to travel to find a store that carries it. I'm trying to focus more on other forms of plant foods for a source of calcium and other bone minerals, as well as protein, and just enjoy the plant milks for the taste and hydration for the most part, but I don't discount the calcium/D and other nutrition in them. Soy milk still performs best in my opinion for baking and cooking, though coconut milk is a good rival for baking and curries. It's much easier and more economical for me to supplement B12 a few times a week rather than always seeking out fortified foods, though they are an added benefit.