I have a crawl space that is roughly 50 square feet in space. The previous home owners installed a piece of plastic sheeting on the crawl space dirt floor. The floor above the crawl space is extremely cold during the cooler seasons. I've been researching a lot about insulating the crawl space, but still cannot decide on which of the following:

1. Installing fiberglass batts in the crawl space ceiling and rim joists or
2. encapsulating the crawl space using rigid foam and 6 mil plastic sheeting.

I received quotes from multiple contractors that vary from fiberglass batts, rigid foam, spray foam or a combination of all three. The pricing is varying from $200 to over $2000 in some cases.

Ultimately, I would like to know which option is best. I've included pics of my crawl space.

My basement does have high humidity in the summer months, but I do have a dehumidifier that runs when it hits 55%. I am not sure if this will be a factor.

Any advice is appreciated.