Well, I'll put my 50 cents here... There are a lot of factors, which influence the temp choice. What type of solder wire, soldering paste, etc you use, what components (these components usually have a recommended soldering temperature, mentioned in the datasheet). Some soldering flux melts at ~185 degrees Celsius. Generally - only practice will tell you which is the best.
Also, as @Ahvarok correctly stated, practice on spare boards. And, when working on real boards, if it's possible to protect surroundings, use polyamide tape (just as an example - https://www.3m.com/3M/en_US/p/d/b10151131/). May save you some nerve when you've touched a 0201 component with the soldering tip by mistake and then you're breaking your sweat to put it back...
Also, as @Ahvarok correctly stated, practice on spare boards. And, when working on real boards, if it's possible to protect surroundings, use polyamide tape (just as an example - https://www.3m.com/3M/en_US/p/d/b10151131/). May save you some nerve when you've touched a 0201 component with the soldering tip by mistake and then you're breaking your sweat to put it back...
