Sega the Best is the Japanese equivalent of Nintendo’s Players Choice offering the best selling titles of last year at a reduced price.
Previous Sonic Team releases under the label include Sonic Adventure 2 Battle and the first two Advance games.
Sonic Mega Collection and Sonic Pinball Party have yet to be re-released as 'inexpensive versions', which may be a possible indication of their lacklustre sales performance.
That and Pinball Party was a Target exclusive on this side of the pond *great idea, make it exclusive to one store so those who want it have to go out of their way to get it); I think must have had similar status in Japan.