There are a lot of disadvantages to stapled up hydronic, main ones being required water temp and heating lag. This has been discussed before here. Besides, it's a new build project in a basement.
I imagine the pex and plumbing is going to cost less than heat tape and wires for comparable surface areas, both initially and during operation. Given the short but somewhat harsh heating season, an outdoor reset control would help prevent under and over heating the house, while still maintaining that "warm floor" feeling.
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