I use commercial seed starting mix or commercial cheapie potting soil that has no fertilizer added (check the bag - most good brands *do* add some fertilizer, and that can mess up seedlings).
I've had inconsistant and generally poor results from Real Soil or homemade mixes, although if buying commercial starting medium was not an option certainly I'd make do.
I don't like jiffy pellets. I know other people do. I don't <shrug>
I've been using the jiffy pellets this year, and everything seems to come up and grow ok, but what I am noticing is when I set them out, if soil is too dry and I water I have a couple that pop out of the ground when the medium swells. This out of four 72 pellet trays though. (not all at once!!) Overall they have been easy, but I am going to try the potting soil and peat pots next just for fun.
I know that I'm supposed to use starting mix but I use Black Gold potting soil, every year. The organic has been the choice.
I once bought what I think was called Daisy Mix. The closest hardware store had it and maybe I liked the picture on the bags .
That stuff almost ruined my entire season!!
So I guess my advice is, "Find something that works and stay with it!"
I make a potting mix with compost, aged manure, peat moss, and soil run thru a screen. But, that is for established plants (mostly perennials) - NOT for seed starting. (Saves me some $$ )