I've done quite a bit of work on bicycles, but haven't had any experience with more sophisticated bottom brackets after a Shimano UN-54 I installed several years ago. That BB, and everything I worked on before it, had lots of size options and measurement/calculation was important in getting an appropriate chainline. It also was easier because square taper was most of what was available at my price point.
Now, I'm just about to start a new build on a Devinci Tosca SL 2 cyclocross frame. I haven't gotten it yet, but I suspect it's a standard BB shell based on the specs, which says the complete bike comes with a Hollowtech II BB. 130mm rear spacing also, if that matters.
So, here are my questions:
1) What are some of the more important differences between the various BB designs out there?
2) Is square taper really that inferior to "outboard" designs? I've done a ton of riding on my 'old fashioned' bottom brackets, without any problems.
3) How can the user decide what sort of chainline to run with many BBs I've looked at which don't come in different lengths?? For example...
What all this boils down to is product selection for this build. I'm planning on running a 1x9 setup, not doing any serious competition, just for fun. I'm not picky about high performance, and value (note, 'value' to me does not necessarily mean cheap) is more important that a few grams of weight or bit of extra drag. Recommendations?