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  • what do you mean by "better"? Commented Sep 23, 2015 at 9:26
  • better in terms of memory usage and performance? Commented Sep 23, 2015 at 9:28
  • 4
    You've already observed that the generated IL is identical, clearly the performance of identical IL is identical. "Better" in programming can also mean easier on you Commented Sep 23, 2015 at 9:44
  • 2
    Consider this: You continue writing, with "Hello" used all over your class. Next week, you are asked for a Spanish version, so you have to replace "Hello" with "Hola" everywhere, vs once in the constant Commented Sep 23, 2015 at 10:10
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    You are micro-optimising. Is your app running too slowly, or using too many resources? If so, profile it, identify the problems and fix them. Until then, write easy-to-read and maintain code. As @Caleth says, the only thing you should be considering at this stage is whether the string is used more than once. If it is, make it a constant. If it needs to support more than one language, make it a resource. To reiterate: absolutely do not try to outsmart the compiler at this sort of level by worrying about speed and memory. Commented Sep 23, 2015 at 10:13