For drop bars BB7s do have more lever pull with Shimano STIs, perhaps related to Shimano’s more recent STI-caliper / Super SLR leverage being slightly different to others. They have a bit less lever movement with SRAM or Tektro levers ime.
BB7 SLs here, critical to set up with new pads and keep the dials adjusted as they wear, there’s a knack to them and once you ‘get’ them all’s great. Spyres are easier to adjust as needed, or less adjustment-critical, performance seems the same to me. I prefer BB7s but I wouldn’t say it’s a ‘better’ brake as such, I’m just well used to them. I’ve used compressionless outers with both but it’s not critical if the brake’s well set up or has a good cable run, if so it just varies the feel of the brake.