Tescos is suited to people who want less account management / community involvement.
And those who don't mind paying 20p per min if their minutes run out or a lot more if they use over 500MB.
tesco is good if you make a lot of phone calls but do nothing else, triple credit means calls only cost 6.66p per min if you use all the free credit they give you, texts are about average, most networkks do them very cheap or free. internet on tesco is absolutely appaling, i bought a new android phone and it used £10 credit in 5 mins just because an application updated in the background, i then tried buying a bolt-on which took nearly a week to activate, by then my phone had again eaten all my credit.
giffgaff wins hands down over all, my goody bags were active within 15 mins, internet took was active next day but would have been sooner due to my phone not being compatible with automatic settings, texts are costing me less because they are mostly free and calls are costing less. giffgaffs main advantage is their automated systems deal with things in minutes not days
Tbh the texts and internet are probably not actually unlimited. Also giffgaff offers payabck and easy to us communities.
Communites - Here you can find an answer to a question usually within miniutes, and you can discuss whatever you like.
Payback - You can earn money, the money can be used for charity, to go into you bank account or to be spent on air time credit. Im pretty sure other networks don't offer this
The texts on Tesco are not unlimited but youd have to text alot to go over! the unlimited internet is actually 500mb a month - not unlimited at all. 0800 numbers are not free and it is not free to call or text other tesco mobiles! I know as I ordered a tesco and a giffgaff sim and after trawling the small print, giffgaff fares better, but it does depend on the individual needs I guess.
I think the comparison here is with the Sim Only on Tesco so the triple credit is irrelevant. For majority of people that are medium users, the 500 minutes for £10 will be unbeatable. Not everyone is looking for truly unlimited like you and me! :-)