Strobes vs speedlights?

I'm a photo college student looking to expand my lighting set up.
I shoot with a nikon 7000 and an sb 600 now.
I just sold my sb400 because I never use it since I have a 600 now.
I used to work at JC Penny's portrait studio, but that's the only studio work I've done.
I'm getting into doing weddings and senior pictures, I love that my 600 can go wireless,
and I really love that I can use it on my film camera.
whatever I get I want to also be able to work wireless and work with my film camera.
I use reflectors and what not now but I want to at least have a main light and I fill light,
I like the idea of getting another 600 because I know how to use it and I can use it wirelessly
at the same time as my current 600 in commander mode.

however, I don't like that if I'm not facing my 600 it won't trigger.

so many say strobes are so much better. Are they?

Added (1). Thanks for the help everyone, that cleared things up pretty well.

I was keeping that 400 for back up but I'm gonna buy a new one before my next wedding so for now, I don't have anything to worry about.

Get an SB-900 and use that as your master. Actually, you could also use your pop-up as a trigger and use the 600 and 900 as remotes. Right now, I think the 900 is the best bang for the buck, given your current equipment. It is infinitely easier to use that the 600, too.

Strobes are often preferred in the studio environment as they are more powerful and have faster recycle times (and don't overheat). But they generally require you to use manual exposure mode in your camera as most do not understand your camera's TTL signalling.

But in a studio environment, that is OK as you have time to setup the photo shots.

In a wedding environment, strobes are often too cumbersome to setup. And being in manual, you don't often have enough time to set them up correctly, as there are a lot of things happening quickly. You could chance ruining the photos with bad lighting in a wedding environment if you use strobes (of course manual was how it used to be done, but things are so much easier now).

Use your SB600 in wedding environments, and perhaps augment that with a SB700 or SB900 so you have a couple of light sources to work with, and perhaps use an umbrella or a Gary Fong Lightsphere (or a combination of the two) to get softer light, and experiment with that (before going to the wedding shoot).

By the time you get to the weddings, you should be absolutely confident and sure of what you are doing - as it is a once-in-a-lifetime shot, without any chance of repeating it.

I think you are trying to contrast studio flash set-ups with on-camera flash guns.

Clearly in a fast moving situation such as a wedding portable battery-operated flash guns are more versatile than studio flashes since you don't need to keep on plugging them into mains electricity, but you need to diffuse them for softer lighting, as you do already. Put a small piece of reflective metal foil on the 600 by means of BluTack to get the sensor to fire the flash at odd angles.

If you are getting into weddings, you really should have kept the sb400 as a backup. Now what will you do if your sb600 acts up during the ceremony/reception/formals?

What I use for my "studio in a box" are 4 yn460's (40$ each) manual only speedlights, some cheap radio triggers (30$ for a kit of one transmitter and 3 receivers… I use PT04) some cheap lighstands, a couple of umbrellas, I'm planning on getting some small softboxes as well.

This kit should work with everything since it. All manual and the transmitter uses the typical universal hotshoe (so no Sony but should work for all other brands).