In the original trilogy, X-wings are often seen as the face of the Rebel Alliance as they are one of the most numerous ships the Alliance have, but during the early rebellion (as seen in Star Wars Rebels) the Rebels use a number of different spacecraft (A-wings are often seen). So what were the most numerous spacecraft that the Rebel Alliance used (with any possible figures/numbers)?
These are the most commonly used ships in the Rebellion. The Rebellion used the CR90 Corvette, commonly called the Corellian Corvette, it was used as a blockade runner and is seen in the first few minutes of the first Star Wars movie released; the EF76 Nebulon-B class Escort Frigate (which the Empire also used, I believe), it is seen at the end of The Empire Strikes Back where Luke gets his prosthetic hand; the Y-Wing, which was developed during the Clone Wars and was used as a bomber, it appears in all three of the original trilogy movies, and it appears in the Star Wars: The Clone Wars television series as its early variant; the Mon Calamari star cruisers, such as the MC75 and MC80 cruisers, the MC80 appears first in Return of the Jedi, and the MC75 appears in Rogue One: A Star Wars Story; the X-Wing, even though you already said that, it appears in every Star Wars movie set during or after the era of the Galactic Civil War; the A-Wing, seen in Return of the Jedi; and the B-Wing, which appears in Return of the Jedi. If any of these are incorrect, or if I am missing any, then please, feel free to tell me. And if any of you can find a site that has the numbers of these ships used by the Rebellion, then tell me and I will give you credit.