The movies. Original crew and TNG crew.
Go Back to where it all started. This contains practically every well known Trek moment for non fans though most Trekkers have embraced a later incarnation as their favourite. Kirk and Co still kick ass
Picard and his crew are very different from the original series and hits in their own right
Two shows at once? DS9 is the only series to be on it's own for half a season yet after a slow start (where have we heard that before), it finally hit its stride in the fourth season
Also coming to an end, Voyager is the least popular after it's inital seasons bored viewers only to have a TNG-style reawakening in the third season.