Some misunderstand what I'm saying. Why choose to carry an obsolete bullet that is outperformed by modern bullets? It isn't for the terminal performance... It isn't for cost savings... Is it the "cool" factor?
I'll use a car analogy. The HST is a new 2005 Mustang GT. The Hydra-shok is a new 1987 Ford Thunderbird. They're both going to get down the road but blatant stubbornness or favoritism aside, one will be a superior performer in all categories. Let's pretend they both cost $5,000. Which would you choose? If you're a Chevy guy I can write another analogy at your request.
50rd - 9mm Federal Hydra Shok 147 GR Hollow point P9HS2G1 | SGAmmo.com 50 rounds of Hydra-shok = $28.
50rds - 9mm Federal HST 147gr HP hollow point LE ammo P9HST2 | SGAmmo.com 50 rounds of HSTs = $26.
One reason the HST is cheaper, is probably because they are easier to manufacture. There's no goofy lead post in the middle of the HP.
Also, HST is an acronym for Hi-Shok Two. It is the second generation of the classic Hi-Shok bullet.
The 124gr HST is also a fine performer. I prefer the greater expansion of the 147gr version.
Concerning +P... +P isn't going to make your assailant do back-flips when shot. It adds a small amount of velocity to your bullet at the expense recoil manageability and it will likely add a miniscule amount of increased wear on your firearm. If you choose +P from a full size handgun, understand you will probably have more 'energy', but slightly LESS penetration than a standard pressure version of the round. This is because the added velocity causes the bullet to expand wider when it hits flesh. Bullet design ultimately controls expansion too. +P in a full size handgun will be more pleasant to shoot than +P from a sub-compact.
I chose 147+P HSTs for my 3.5" Ruger SR9c. The main reason is because that was what was available at the time, not that I really wanted or needed +P at the time. Recoil is stout, and feels closer to .40 from a full size, but quick follow up shots are very do-able. An advantage with +P out of a shorter barrel is now my velocities will be on par with a 4-4.5" barrel shooting standard pressure.