Pioneer App Radio 4 install and SWC options (HELP)

[ReLL954]

Ok I recently purchased a the pioneer App radio 4 ( SPH-DA120)
Now I've read some of the threads and want some advice.

I have a 13' base


First : is it necessary to purchase a bezel kit or can it fit with out one ?

Second: which SWC would you guys find to work the best and effectively.
I was reading some success with axxess and some with PAC . But most of the threads seem to be older so just as a update which do you guys finds works best ?

Anything else you guys wanna add please feel free thanks