Is a custom tune worth any more power/ reliable?

Hi , got a 2012 800 outty xt-p, just in the process of fitting a pc-5 and a
looney tunes slip on.
The pc site has maps for 3 different slipons , no filter changes , and no other mods , just like mine.( not for looney toons)
Just asking , the difference if I say just used there fmf slip on map , verses , getting a custom tune , from the local quad shop thats quoted me around 250 us dollars.
I really dont mind getting it done , but will the custom map , really be that much different to a map , for another type of slip-on , fmf, hmf, leo vance etc etc.
Feel free to educate me.:th_smiliewoo: