Question: But Beis Hillel also said that 'Wine is more common'?

Answer #1: Not for that reason alone does the Chiyuv of the day takes precedence, that we should say on its account that 'Shehechiyanu precedes Sukah.

Answer #2: It may also be that the Gemara is only coming to explain the opinion of Rav according to how he holds, and not according to the reason of Beis Hillel (See Maharam & Tosfos ha'Rosh)).

Explanation #1: We are not concerned with the fact that the S'tam Mishnah says 'Here is Matzah, here is Chametz'.

Explanation #2: Alternatively, the Gemara also considers Lechem ha'Panim 'Chovas ha'Yom', even though the Loaves are from the previous week.

Explanation #1: This is a popular adage - Someone who says to his friend 'I am giving you a small Dala'as that is still attached; Should you wish to leave it until it has fully grown and turned into a Kara, that's fine' ...

Reason: He is advised to taske it immediately, in case after a while, the owner will change his mind or perhaps he will no longer want it.

Explanation #2: Rabeinu Tam however, explains that 'Butzina' and 'Kara' are two different species ...

Source: Since Unklus translates "Kishu'in" as 'Butzina' ...

Source (cont.): Whereas 'Dala'as' is synonymous with 'Kara', as is evident in Nedarim, Perek ha'Noder min ha'Mevushal (Daf 51a) where, in reply to the question 'What is a Dala'as?, the Gemara says 'Kari Karkuza'i'.

Proof #1: And Kishu'in and Dilu'in are two species, as is evident in Maseches Kil'ayim (Perek 3, Mishnah 5), where the Mishnah rules that 'One may plant Kishos and Dala'as in one hole ...

Proof #1 (cont.): Provided he turns them in opposite directions, and the hair of one of them one way and the hair on the other one, the other way.

Proof #2: From the Gemara in Perek Sheloshah she'Achlu (B'rachos, Daf 48a) 'You can tell (the quality of) a Butzina from (the time it grows out of its sap - implying that it is called a Butzina after it has ripened.

Explanation #2 (cont.): Rabeinu therefore explains that Kishos is a smaller type of fruit than Dala'as (both from the family of pumpkins), since it ripens sooner, at which point one is already able to pick it; whereas a Dala'as is larger, since it does ripen as quickly and one is only able to pick it at a later stage ...

Reason: And a person prefers a little now to a lot later ('A bird in the hand ... ').