You'd likely have an equal chance of success with either product, which is to say pretty much no chance at all.

The description of how Serracor is supposed to work is ludicrous. The company claims its product has enzymes that work on "fibrous" tissue or "fibrin" (they seem confused about both terms). The problem is that fibroids are actually composed of smooth muscle, not fibrous tissue or fibrin, so the enzymes they claim are in the product would not shrink fibroids. Any enzymes you could take in pill or capsule form would be broken down by your digestive tract before they got into the bloodstream. Anything of that sort that could be devised to work on smooth muscle would attack other smooth muscle in your body and cause havoc. And if their enzymes attacked fibrin (a substance your body produces in making blood clots) you'd likely have severe uncontrollable bleeding. The comforting thing is that Serracor as described by the company is probably inert.*

FibroidClear throws together a brew of herbs that has not been shown to do anything to reduce the size of fibroids. That company pretty much acknowledges this by listing only testimonials (no research) and putting in the standard disclaimer about how their product is not promoted to treat any disease.

One thing both websites get pretty much right is that there are hormonal therapies for fibroids, which may work but come with potential undesirable side effects. Limited surgery (myomectomy) has come into increasing use as an alternative to hysterectomy and which is effective in numerous cases for relieving symptoms and/or preserving fertility.

*note: this website has its facts wrong when it comes to a number of things about fibroids, including suggesting that they need to be eliminated because they're premalignant (they are benign tumors that very rarely are thought to exhibit malignant change).

Here is a link that might be useful: Facts on fibroids (leiomyomas)

Sorry, the link I posted is about leiomyomas from a dermatologic standpoint. Here's one on uterine leiomyomas.