Of course, you could just use what you are comfortable using
I find celsius easier, because that is what I was brought up with. In fact, whenever I hear a temperature in F I convert it into C before I can make sense of it! But, there are a couple of sound reasons in favour of fahrenheit
1) finer scale (there are 1.8 degrees fahrenheit in 1 degree celsius)
2) more "natural" numbers (0 is bl**dy cold, 100 is bl**dy hot!)
Personally, I can't see it is any great labour or crime if the weather forecasts included both scales as they did until a few years ago (was probably only 5 or 6 years, IIRC).
Most cars have a temperature read-out now. My mum drives a Peugeot, and you can make that display in Fahrenheit... seeing as the US is the only country that still uses it on a wide scale, and seeing as Peugeot doesn't sell in the US, it can only be because they understand some people like to use F still.
Of course, if you want to confuse 99% of people, you could use the Rankine scale (like the Kelvin scale 0=absolute zero, but uses a graduation of one degree Fahrenheit)... on this, your 45 celsius would be (45+273)*1.8 = 572R
Or, to confuse 99.99% of people you could use the Reaumur scale (0 is ice, 80 is boiling water) in which case it is 0.8*45 = 36 degrees Reaumur.
I guess if you are into old engineering you could probably work "slugs" into it too.