It would be best for you to know what you want to achieve. For studying etc. testnet would be best.
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ken757131544 commented on Do u have any estimates how expensive itd be to run a node on the prod net?
Only if you wish to particiapte in something requiring ADA would there be costs in addition to expenses of hiring a server. If uou have one in your bedroom uou won't be incurring any recurring expenses.