and any decent recruiters/guild officers will then ask you about the details which they will understand at some point that you're leaving a guild because you don't have first dibs on mount rolls. At that point how they want to assess that information is up to them, but for me being so vague about why you're leaving a guild is a huge red flag. I would rather people be very specific about it.
While performance is very important, spotting guild hoppers is more important because they often hurt the guild more than they help. I'm not actually trying to imply the OP hops or doesn't hop, or that his guild is fair or unfair, but I do care about why a player left their previous guild, especially when it is as progressed or more progressed than the one they are currently applying for.