Like in most of the cases - BOTH.
But,it depends on you.
If you're good with quizzes and general questions or can predict certain things (final price of the auctions or answer to the question of Time Machine game) or like and follow NFL and betting - then Eager Zebra games are for you.Go and win those games,it will bring you share(s) of Zackpot.It's free or costs only 1 TC to enter.But it can bring you less TC comparing to auctions (for 300,400 or 500 TC packs) - if you're after getting more TC.
On the other hand,if you're not so good with above said,then auctions can be your choice.It can bring you pretty much T-credits (if you win auctions like 300,400 or 500 TC packs),more then a share of Zackpot from Zebra games.But it takes more TC to put into to win (alike Zebra games where it's free or only 1 TC).From auctions you can get some valuable items (already mentioned packs of TC,then S-builder,PSAs,CSAs,Gift cards,lap tops,mobile phones...) for very LOW price.As low as 99,99% of retail price.
Tip:if you're short with T-credits you can start with Zebra games and when you win some of it then you can go to auctions.
So,I advise you to combine it both:go play Zebra games,go bid on auctions,there's no need to separate taking part in just one of them.
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Like in most of the cases - BOTH.
But,it depends on you.
If you're good with quizzes and general questions or can predict certain things (final price of the auctions or answer to the question of Time Machine game) or like and follow NFL and betting - then Eager Zebra games are for you.Go and win those games,it will bring you share(s) of Zackpot.It's free or costs only 1 TC to enter.But it can bring you less TC comparing to auctions (for 300,400 or 500 TC packs) - if you're after
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