> The sink supply connections (usually from a shutoff valve) are compression threads I've seen both compression and NPT. I only have three faucet-replacement d

> The sink supply connections (usually from a shutoff valve) are compression threads I've seen both compression and NPT. I only have three faucet-replacement data points to work from, but I haven't developed a feeling for why manufacturers will choose NPT in some cases. Compression fittings are pretty straightforward, IMO. No complaints from me about those.