While I agree with the above posts concerning early dives and camera use, I'll provide an answer to the question asked, just so you'll have it when you need it.
I haven't used the SeaLife DC1200, but I do own both a SeaLife Mini AND I was just given an Intova IC12 for Christmas. So far, I'm pretty much loving the Intova. As a point and shoot, it has a LOT of features and settings, but they're all extremely easy to access underwater. I'm really enjoying using it topside for day to day pix, and that just makes it easier to use underwater since practice does, indeed, tend to make "perfect" (or at least closer to perfect). For the most part, it's intuitive and when the camera is set correctly (be sure to use the manual white balance setting...gets rid of that pesky blue tint), the camera takes very good digital photos and surprisingly good video when the light is adequate.
Now there are a few downsides. The on-board strobe is, as is the case with most point and shoots, a bit anemic. You'll want to invest in a good strobe (which I haven't done, yet). I had intended to use my SeaLife strobe, but it won't synch with the Intova.
A more problematic issue is that the lense housing partially blocks the lower-left hand portion of the picture from the onboard strobe, a situation called "vignetting". The makers suggest an add-on plastic diffuser to scatter the light more effectively (about $7.00), but I chose to take a white plastic bag (like goods go home from a store in), cut a template from it matching the front of the housing, insert the template into the housing over the camera face, and close it up. The results are surprisingly effective, and the vignetting is almost totally gone. Zoom in one "click", and it's gone altogether from the frame.
I'm still exploring the little camera's features, but so far I'm impressed, particularly since the whole rig is less than $240, housing and all.
Hope this helps. Dive as much as you can, perfect basic skills, and then have a ball with your camera, whichever one you choose to go with.