Pick the pedals of your choice. Adjust them to the loosest setting, and try to concentrate on remembering to unclip in advance of stopping early on. After a very short while, the unclipping will become part of your automatic and unconscious process as you prepare to stop, and your concerns will take care of themselves.
As noted, the mtb systems are a bit more forgiving, but, I suggest you start out with whatever system you intend to end up with.
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