My baby is a Glock 26 (G26) (obtained Spring 2014 - cycled ~3,200 rounds since). I have previously been assigned/owned/carried Beretta (92 (9mm)) and Sig Sauer pistols (228 (9mm) / 229 (.40 and 357 SIG) / 239 (357 SIG)), but am a Glock convert and believe in the 9mm. My other baby is a G19.
Favorite Practice Ammo: 1) Speer Lawman FMJ 115 grain OR 2) Federal American Eagle FMJ 115 grain
Favorite Duty/Carry Ammo: Speer Gold Dot Short Barrel 124 grain
In my OPINION, if you haven't had a squib round with 9mm Winchester White Box ammo, you haven't shot it through your weapon enough. This may have been an anomaly, but over the past three months, I have shot through a case of it and had four squib rounds. I only had the ammo because it was free, as was the previous case of CCI Blazer aluminum cased ammo (no issues), but if I have to buy ammo, or am given a choice as to which to shoot, I choose the Speer or Federal.
For all ammo, I PREFER brass cased ammo to all others because it is softer than steel and aluminum, which is easier on the extractor. Yes, I know extractors are made of steel, but if you cycle enough rounds through ANY weapon, and it has a weakness, it will be exposed.
Finally, if you are shooting through an SB gun like the G26, using the Gold Dot SB ammo is ideal. If you don't believe me, pick your favorite SD/duty/carry ammo and shoot it at a target (my favorites are the blue Transtar silhouettes) two to three feet away from the end of the muzzle. Next, shoot the Gold Dot SB from the same distance and observe the target. Typically, the non-SB ammo will leave more stippling on the target caused by powder not burned in the barrel behind the bullet where it is supposed to, and needs to, burn to give you maximum velocity. Often times the SB ammo leaves no powder stippling at all. Also, the GD bullet does not shed its jacket, which allows maximum weight retention for deeper penetration in your, ahem, "target"; the only other HP bullet I have not seen shed its jacket when shooting through auto glass is the Barnes DPX, which has no jacket, as it is 100% copper.
Again, all if this is my OPINION, and others may disagree with my assessment. When all is said and done, practice practice, practice.