Well if you’re talking about privacy, then the answer is yes. Vivaldi only collects what pc specs you have or something like that to see how many users day have. Way better than what google chrome does. But I guess yes you are technically supporting the chromium engine monopoly but tbh just use what you like.

In adittion to this make sure to disable the telemetry that’s on by default. If you want even better protection from fingerprinting etc, use arkenfox/librewolf (librewolf being preconfigured fork of firefox)