I am considering ordering some new cranks/ BB and was wondering about the differences between splined and square taper. I understand them both in terms of design, but I am curious to know what each type offers in terms of benefits, strengths, flex etc?

I ask because when I purchased my first SS bike (maybe a year and a half ago), the cheap, square tapered cranks I had on kept coming lose and I ended up needing to switch out my cranks. My LBS guy recommended a splined BB as he assumed that me being so tall ( 6'3" 200lbs) I may need a different style BB.

This happened a while back when I was a noobie

Any opinions....?