Those are the two best designs by far! I have a 1921 2 Peso but not the Caballito; if I remember right those are a bit more pricey.
Here are a few I had graded. One I got 2-3 weeks ago and just sent to be graded. and a today new purchase
50 centavos 1950, silver .300, weight - 6,66 g., size - 26 mm, thickness - 1,7 mm, mintage - 13570000 pcs. Mexico City Mint. Such coins were released at 1950 & 1951.
Carlos III (1759-1788). 1/2 real 1783, silver .903, weight - 1,6917 g., size - 17,2 mm, mintage unknown. Mexico City Mint. Coins of this type were released at 1772-1784.