[yardlettuce]

Sorry for the clickbait title, I was just wondering what you guys thought of the Epiphone 1956 LP Pro Epiphone 1956 Les Paul Standard PRO as compared to the Fender Mustang 90 Fender Musical Instruments - Mustang 90, Rosewood Fingerboard - Olympic White. I've played the Mustang and absolutely love it, but I haven't seen any LP pros at Long and McQuade. I usually play punk, grunge, alt-rock, rock, a little metal, blues and some RHCP type stuff (like Under The Bridge or The Longest Wave)

 

[aC2rs]

L&M do show the 1956 Epiphone LP as still being available in their system, so your local store might be able to bring one in for you to try.
Epiphone - 1956 LEs Paul Standard - Goldtop

Is it the p90 pickups that you are after in particular?
If not, you might want to have a look at this Epi Les Paul Standard Pro - Desertburst that is on sale this month and there seem to be quite a few available.
Epiphone - Les Paul Standard Pro - Desertburst
It does have coil splitting for single coil tones .

 

[Budda]

Two different guitars, and I would expect both to be good guitars. Pick the one that speaks to you.

 

[cboutilier]

Both guitars will do what you ask of them, albeit a bit differently. Get whichever feels best in your hands.

I would think an HSS Strat would also suit your needs well. Alas, as always, my advice is to buy a Telecaster

 

[troyhead]

It does have coil splitting for single coil tones

I get that coil splitting probably has its fans and people find good uses for that tone. But I've never found it to resemble a good single coil. Coil splits sound thin and shrill to me, exactly the opposite words I'd use to describe a P90.

Mind you, I typically don't like pickup positions 2 & 4 on a Strat for similar reasons, while other people use them a ton. So take my opinion with a grain of salt.

Get whichever feels best in your hands.

I would agree with this suggestion, and add to consider whichever sounds the best to your ears, and whichever looks the coolest to you. Seriously... you will probably enjoy playing it more if you like how it looks.

Alas, as always, my advice is to buy a Telecaster

Yes, do this. Just always buy a Tele.