Which Philips OneBlade for butt/balls?

Hi guys! I don't like feelings after using a typical razor in my intimate area. I tried the usual trimmer, but it looks dangerous, especially on balls. Found few comments around the Internet about One Blade from Philips, but can't recognize, which one is better: One Blade, One Blade Face + Body, or One Blade Pro. Thank you in advance!

P.S. I don't downvote for any comments.