Tan Witness-Feel; Ruger-Service
Choice is a toss-up in some ways.
The Tanfoglio Witness(please, oh please, don't call it an 'EAA' Witness) has the cozy feel of the CZ design(which many, if not most, people like). Unfortunately, the importer/servicing agent for Tan's in the USA is EAA. Brrr, I get a cold chill just thinking about that(or a hot flash, not sure). The Tan also offers the ability to convert with top-end kits.
The Ruger P-series doesn't have the feel of the Witness in the hand, but I've never experienced the type of unprofessional, non-customer service from Ruger that I experienced with EAA. Additionally, none of my Ruger's failed to function straight from NIB. The only blemish was a several years old MKII Ruger target that had developed feed and extraction issues. Communicated with Ruger; send it back they said. Returned with new barrel installed and no cost, not even return shipping(ya listening EAA). No problems since and only that single trip back to Ruger. Both my KP94 & KP91 digested absolutlely everything(ammo wise) that they were fed. Later I managed to pick up a KP944 top end and used that on the KP94 lower; again, no problems with any ammo type. All examples exhibited fair to good accuracy 4 1/2" to 3" at 25 yards.
If the Tan Witness ever gets a new USA importer/servicing agent, I'll give it a better consideration for future purchases. As it stands now, from my experiences with EAA, I know the I'll be own my own for 'reliable and professional' service should it ever be required. the Ruger P-series may not have the 'feel/fit' of the Tan, but every one I've ever used has worked new, straight from the box, no problems. Through Hogue rubber grips on the Ruger, some tritium night sites and grab a few original capacity mags and you'll have a reliable combat ready handgun. The rest is finding ammo the P series likes, a handload that replicates it and then lots of practice.
Good luck!