.ל"ג The Three Inserts

מזכירין גבורות גשמים בתחיית המתים ושאלה בברכת השנים והבדלה בחונן הדעת

It is interesting that the three are not listed in the order in which they appear in שמנה עשרה. In the משנה, since there is a מחלוקת, perhaps it was preferable to leave the מחלוקת to the end. However, when this is repeated in the ensuing גמרא, it follows the same order even though they are dealt with separately. (I suppose you could say it was just following the order of the משנה.) But it would seem to me that the listing in the משנה is specifically ordered by תדיר. That is to say that גבורת גשמים is clearly said most often - from סוכות to פסח. And of course we say ותן טל ומטר less often as it only starts at the earliest, shortly after סוכות in ארץ ישראל. Lastly, we say אתה חוננתנו least often - around 60 times per year or so. (Even if גבורות and שאלה refer to whichever is inserted, including מוריד הטל for נוסח ספרד, etc. it is still said more often since שאלה is not said on שבת and יום טוב.)