Guild Wars 2

Fused
Pros-
They were inside regular BL chests which allowed you to at least get items for your tries, valuable ones at times.
BL chests are dirt cheap on TP.
Cons-
They were not available as drops in game, making them gem store only items.
They were very rare, and RNG held back tickets from many people who paid much money in gold as well as cash to receive.

Southsun
Pros-
Available on gem store and in game from drops.
Gave some useful items at times which could be used for the exotic karka shell or sold.
Cons-
Very low chance of drop again, also boxes seemed to be affected by DR for some people and were not dropping steadily.

Dragon Bash
Pros-
Available on gem store as well as drops from in game.
Drops much candy for jorbreakers from Gem version.
Cons-
Gem store ones are costly and had stated better chance, but that chance seemed poorly planned into pricing as some people spent anywhere from $10-$400+ without a ticket.
Coffers in game are still somewhat expensive and cost in game gold.
These (IMO) skins are some of the best I have seen design wise, sadly they are very very difficult to obtain for such an interesting and nice event.

If anyone has info on the holiday/event RNG chests before these feel free to share.