I was playing a show last night and I broke a string! I didnt even know that was possible on a bass guitar. Well, the reason for this post is I need to buy new ones and I am open to any kind. I just broke one of my strings which was from a 5 string se called Slappers. They werent that great. I love to slap but also play a lot of smooth warm bass lines. My bass is a Squire MB-4 which is like a P-bass and a J-bass combined (I was short on cash so i went for the cheap one). I have another show coming up tomorrow so i need new strings desperately.
Well...since you don't really seem to have a preference, I'd think about picking a set that matches the guage of the strings you have on your bass...as no one likes a surprise when it comes to playability when your on stage, and you are playing tomorrow. For slap, you should think about stainless steel strings as they're a bit more aggressive sounding than nickel. The only drawback is that they can be rough on your hands. I'd suggest that you'll do OK with any of the 'big brands' of strings...GHS, D'Addario, DR, Ernie Ball...They'll all do ok for you. I'd stick with round-wound as the night before a show isn't really the time to start experimenting with flats, tapewound, etc.
I'd try DR Lo-riders. Stainless steel for a great slap sound, but they can also go mellow with a few tweaks to the eq and pickup selection.