Like others have said, for anything other than a dive knife (or a knife that can't be magnetic), the SH will FAR outperform the Mission. Although the SH is far heavier, this allows heavy chopping with the blade. Titanium doesn't hold a good edge. That's the bottom line. Almost ANY steel or stainless steel will outperform it in this area. INFI is one of the very best steels on earth, and it therefore far outperforms Titanium in edge holding, and it has legendary toughness also. It, for example has been bent 30 degrees and has come back true (the knife being tested was the Battle Mistress). I would most definitely go with the SH unless you will use it as a dive knife or need a non-magnetic knife. Even as a dive knife, the SH shouldn't be too bad. I've heard it has corrosion resistance similar to D-2 or even ATS-34. Plus, the crinkle coat on the blade is very durable and will not allow the blade to rust. An interesting thing about when INFI does rust is, it appears to hardly affect the edge of the knife, one of the worst things about the rusting of conventional steels.
Get that Steel Heart 2 E!! I've got one, and I love it.