I recommend some sort of 4G, you don't need to buy anything, just put your phone on tethering.
Regarding Alfa vs Touch, check the reception and services in your area. I would try to ask people who live there about their experience with either.
If you are some sort of download-addict, you will have to change your habits temporarily. 4G data volume is not exactly cheap here.
I think it is a good choice, because 4G is relatively reliable and fast normally. Coming from abroad (most of the world anyway), this will minimize your "internet shock".
I can't comment on Wise because I have little experience with it (however there is
a whole thread about them). If it is reliable then it might be a good option as well.
They also have another option called "WiseMax" which is faster.
Apparently you can
buy refills online