I'm an S-modded solar shields kinda guy myself; the complete erasure of random supply loss from storm surfing considerably extends both the length and speed of my expeditions by reducing the variation in supply consumption while leaving valuable cargo room free that would otherwise need to be filled with costly supplies at the start of a voyage. That means less stockpile withdrawal bills and more room for loot! Incidentally it also means no getting caught by random hostiles with several ships at low CR thanks to a recent storm hit. BRING IT ON, ORDOS.
As for burn, I'm not really concerned about hitting 20 burn most times. I find 18 sustained is plenty sufficient to catch or escape any fleet in the sector, albeit sometimes with a bit of clever maneuvering. Plus it means hacking nav buoys is actually worth it and so is the +3 bonus from gathering all that navigation data, which will get me to 20 burn anyway, in-system or out, respectively. So while the atlas USED TO BE a hard sell because of the speed, there are now wonderful answers that make it a non-problem, even without S-modding augmented drives. I've used the colossus for cargo plenty of times but when the opportunity presents itself, I do tend to upgrade to an atlas so I never have to worry about cargo space for the rest of my fleet.
That being said, since a colossus DOES have a higher base burn, you CAN ultimately make a fleet with them go even faster. While there might not be MUCH call for a fleet that can go faster than 10 base burn, keep in mind that this also affects your "moving slowly" and "go dark" speeds too! Super speedy smuggler/spy satellite gameplay, GO!