Combination of both can be very effective in winning the auctions.
Let's say you put auto bid in the beginning, then when the timer says "going once" turn off the auto bid, this is to save you T credits. Most bidders will click on the during last seconds so you stand to lose more T-Credits if you are on Auto bid.
The more T-Credits you save, the longer you can keep on bidding.
Just my thoughts....
