Kommentar zu Berakhot 8:1

אלו דברים – [According to the School of Shammai], he recites the blessing on the [Sabbath and/or Holy] Day – at the beginning the Sanctification of the Day and afterwards, recites the blessing on the wine, “Who creates the fruit of the vine/בורא פרי הגפן”, since he first sanctifies the day and afterwards the wine comes on the table because of the day – and just as he sanctified [the day] at its outset, similarly before the blessing of the wine (based upon the principle: "תדיר ושאינו תדיר, תדיר קודם"/"That which is more frequent vs. that which is less frequent, the more frequent comes first” – see Tractate Horayot, Chapter 3, Mishnah 6).

These are the points [of difference] between Bet Shammai and Bet Hillel in regard to a meal.
Bet Shammai says: first he blesses over the day and then over the wine.
Bet Hillel says: first he blesses over the wine and then over the day.
The eighth chapter of Berakhot deals with disputes between Bet Shammai and Bet Hillel concerning various customs and laws governing food and behavior during meals.
The first mishnah contains a well-known debate over the blessings made during Kiddush on Friday evening or the eve of festivals.
Bet Shammai and Bet Hillel debate the order of the blessings recited at Kiddush. Bet Shammai says that we first recite the blessing over the day. This blessing is “Who sanctifies Israel and the festivals.” Afterwards we recite the blessing over the wine, “Who creates the fruit of the vine.” The reasoning for this is that according to Bet Shammai the day causes the wine to be drunk. Bet Hillel says that the wine is blessed first. There are two reasons for this. First of all, the presence of the wine allows us to recite the blessing over the day. Secondly, the blessing over the wine is a commonly recited blessing whereas the blessing over the day is rare. The rule is that common things are recited before uncommon things. The order which we follow today is, as is almost always the case, according to Bet Hillel

מברך על היין – [According to the School of Hillel, he recites the blessing on the wine] first, and the same applies to making Kiddush on the Bread (if he lacks fruit of the vine) since the wine or the bread cause [the need to] Sanctification of the Day, for if he doesn’t have wine or bread, he cannot recite the Sanctification/Kiddush.