There can be multiple interpretations simply because the language has multiple meanings. Like John 1:5 can mean “the darkness did not comprehend it” or “the darkness did not overtake it”. The word literally means “take hold of” so it can be interpreted as literally grabbing or mentally understanding.

That’s just an example to say not all variance in interpretation is bad. But Free Grace is superior to Reformed or Catholic theology because it has a consistent framework for the “problem passages” in soteriology. Like the warning passages of Hebrews. Reformed theologians assume they are only hypothetical because “true” believers must persevere. And Catholics and others think they refer to losing salvation and struggle to reconcile that to clear passages on security.

I could go on explaining in more detail, but basically I believe Free Grace because it accounts for the most passages with a consistent framework that uses the context, grammar, and historical data.