My vote is for the Morrison Conoco. Essentially a fine jumping off place for any ride... north, west, or south. Keep it simple. Same place every ride. Easy C-470 access.
Have led many rides to the north from Morrison, and since most rides want to get up to the Peak to Peak, Morrison offers easy access to Central City Parkway, Golden Gate, Coal Creek, even the sedate Clear Creek. Most riders don't want to drone north on 93 much further than Coal Creek. Slogging through Boulder and riding congested / tar snake Boulder Canyon is not at the top of many favorite rides list.
Morrison also provides access to points west... Bear Creek, Squaw, Stagecoach, Berthoud, Loveland.
South? South and North Turkey Creeks, Indian Hills, Brook Forest, Pine Valley Rd., Deckers... even great rides into South Park... Hwy 9, High Park Rd., Hoosier, Bishops Castle, Arkansas Canyon, Monarch, and Cochetopa. Have rides planned for Independence Pass and further this summer.
Finally, a very large parking lot and one sees a lot of other bikes gathering and rides launching.