BERETTA 92FS / M9:
I first fired the 92F out at Mott Lake in '83 (JSSAP trial weapons which we ran through the ringer).
I've been issued an M9 (a total of 8 weapons) continuously since 1994 (replacing the 1911A1s issued in my units prior to that).
I've owned two 92FS models. I still have one of them. I like to have a personal copy of whatever I carry at work...it reinforces training drills.
I've broken several locking blocks on my issue Beretta pistols (which have had a lot more rounds put through them than my personal weapons). I've also had a couple of trigger return springs break. Hint: In a pinch, turn the pistol upside down and pull the trigger. It will still fire.
My privately owned 92FS has never had a problem. It has the older (military) style locking block. It has yet to give up the ghost. On the other hand, that Beretta is just a range gun for off-duty shooting.
I've lost count of the locking blocks broken in my presence on various ranges and deployments. Not an uncommon occurrence (and pretty widely regarded as normal) inside most USSOCOM units.
During a 5 month period in 1999, 47 M9 locking blocks failed (sheared) out of 83 assigned weapons in my company. This after some admittedly hi-volume firing.
At my most recent range session (last week), seven Beretta locking blocks went south in the first two days of firing. All student weapons were M9s. Rob Leatham was our instructor. Rob's pistol was (naturally) a .45 XD.
CZ 75/85:
I purchased my first CZ75 in '92, followed by a CZ85, followed by a CZ75B. I still own the 75B. I've put about 7000-7500 trouble free rounds through that one and it is my favorite semi-auto. It is also my only semi-auto home defense pistol (other HD handguns are 4" .357s loaded with +P .38).
My experience with the CZs is limited to the three I've owned, two or three I've fired on overseas deployments (host nation weapons), and the half a dozen or so weapons owned by friends at the range.
I've yet to have a mechanical failure with the CZ series, nor has anyone that I personally know. That said...I'm aware of the slide-stop failure stories. I believe them to be true.
So...What the hell is my point?
The three pistol designs with which I am MOST comfortable and proficient (due to long exposure, practice, and training) are:
The 1911A1, the Beretta 92, and the CZ 75. All of them perform. All of them feel like an old friend when they come to hand.
The only one I worry about breaking in my hand is the Beretta.
Thus, in answer to the OP's questions:
"Many people say that Beretta's locking block doesn't last but seriously do you really think that CZ's slide stop lasts longer?"
YES
"Which one would you rather have for the rest of your life, CZ or Beretta?"
CZ
It's my opinion and YMMV (Flame On...
)