Is Valvoline MaxLife ATF better for my transmission than the $3 stuff?

My tranny was serviced with the 3.50 cheap ATF. It takes awhile to warm up, then shifts alright. When it's cold, it soft shifts 2-3 (bit of a "braking" delay before 3rd locks) and firm 1-2 shift. Do you think putting in a few quarts of the synthetic stuff will help? Is it better/less thick???
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