Take the RG-11. You won't find a better cost/results ratio using free RG-11, especially if the connectors are included. LMR-400 is good cable and rather low on the cost end for commercial coax. It appears to be "so dang expensive" if you compare it to the cheap low-quality TV cable you can find everywhere, but comparing it to who it competes with (RG-213, RG-214, etc) it is equal to lower cost. Comparing it to the commercial standard for tower runs (Andrew Heliax) it's quite a bit cheaper (and higher loss).
LMR-400 is fairly low loss cable and will perform better than what you normally find available for consumer-grade scanners like RG-58 or RG-8. It's a bit harder to work with and install since it's rather stiff cable, but still workable. For fairly short runs (75 - 150 foot or so) should perform well. For much shorter runs (50 foot or so) standard RG-6 is a good, cheap option.
The choice is yours. Go with expensive, low loss, and hard to work coax with for longer runs or when low loss is critical or save some money and use easy to find, work with, and find cable-TV coax for shorter runs where low loss isn't quite as critical.