As I have patched Wireshark to fully support Npcap mode, there's no issue for Wireshark no matter whether Npcap is installed in Npcap mode or WinPcap-API compatible mode. However, I recommend installing in Npcap mode directly because this is the default option in the installer.
Which is better Npcap or WinPcap?
Npcap is a library for packet capturing and sending on Windows, developed by the Nmap project, and is actively maintained, while WinPcap is no longer actively maintained (unless WinPcap's community steps in). If you have a prior version of Wireshark installed on Windows (like 2.6. 7), and you perform an upgrade to 3.0.
Is Npcap safe to install?
Npcap is a modern, safe, and compatible update to WinPcap.