Sorry and I hate to rain on it here but Easter Special and Big Haul wouldn't count as Greatest Moment packs and Thomas Makes a Mess is missing unless it's just counting Fisher-Price TrackMaster only. 
Regardless of that, it still is a hard choice. Thomas with Annie and Clarabel is an essential combination, and Slippy Sodor is not too bad with nice decorations on the brakevan, flatbed, and Thomas' funnel. Thomas Makes a Mess is also pretty good but since it was the start of the three car Greatest Moments and they look like they were done last minute, the empty truck is a waste. Thomas' Big Haul does have some pretty neat rolling stock though.
Regardless of that, it still is a hard choice. Thomas with Annie and Clarabel is an essential combination, and Slippy Sodor is not too bad with nice decorations on the brakevan, flatbed, and Thomas' funnel. Thomas Makes a Mess is also pretty good but since it was the start of the three car Greatest Moments and they look like they were done last minute, the empty truck is a waste. Thomas' Big Haul does have some pretty neat rolling stock though.
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