You don't need that kind of temperature control for personal developing from 6 to 20 minutes, especially if you're in a temp controlled environment (i.e., inside) as almost all B/W is standardized at 20şC (i.e., room temperature). I don't use water jackets with open trays, and I'd be surprised if many here do either. Any real temperature variations will likely either be insignificant or built into your work flow as you learn to process.
Nothing could be simpler and less inexpensive than trays. You might as well learn to do it (easy) before investing in other, more involved, techniques. At the very least, it will give you a reliable method to fall back on if/when your tanks, rollers, cap, etc. fail you (i.e., see voluminous threads here).
Almost any film is good with a general purpose developer like XTOL. See the Massive Development Chart.
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