Pls help! 2-bar MAP vs MAF or both???

Just curious...I have a 2.4l Turbo charged Ecotec to 310whp. Using a speed density tune with a 2-bar map sensor...

Obv there is debate over which is better, a MAF tune or Speed density tune for different things...I do track my car, but also use it as my daily driver...my question is, i heard that altitude and weather changes can mess up SD tunes...but MAF can calculate changes like that. Some ppl say a proper SD tune wont need a MAF. Which is correct? Can i run both? I do wanna be able to drive my car in any condition, from -40 to plus 40, (i live in Winnipeg, it happenes...) or take my car to Yellowstone Park or Banff up in the mountains without it messing up my idle...tune or WOT...

Comments?