Use whatever works for you. I first learned on a manual focus 35mm SLR that had both Aperture Priority or full Manual Mode. It offered center weighted metering so I found center weighted metering on a DSLR better than Matrix metering for my preferences. I was already accustomed to using it. Center weighted simply measures the majority of the light within the circle area. If a lot of the sky is in the image, or if the background behind the bird is really bright, then I use the +/- button to overexpose by around .7 stop. Sometimes I have to go to 1-stop over.
I just couldn't get Matrix metering to work for me. My exposures were all over the place – sometimes way too over exposed and other times not enough. The thing with Spot Metering is if you focus then recompose. Unless you use the exposure lock button to make sure the exposure doesn't change when recomposing, I don't think it will be accurate. And if I'm using back button focus, that button is assigned to focus, not to lock the exposure.
Like I said, find what works for you. Play around with the different metering options. Maybe you will have to switch from one metering method to another depending upon the scene in front of you. Back when I shot 35mm, I also used a handheld light meter. Incident metering is when you stand where your subject is located and aim the handheld light meter towards the camera. It is more accurate than reflective metering which is what our camera's use. I had the ability to input my aperture and ASA (ISO in digital photography) into the light meter and it would give me the shutter speed to yield an 18% grey image. Having used the light meter enough, it helped me intrinsically learn differences in lighting. A handheld light meter is something most people don't use. In certain conditions, usually indoor events where the lighting varies around my subject and when I cannot use flash, is when I still find it to be helpful.