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It's a bit more nuanced. Let's keep it simple and say you produce 3 data sets when browsing and clicking on results: search queries, DNS queries, HTTPS queries.

If it takes a correlation of the 3 datasets to identify you, then it is better to use 3 different providers.

However, if any one of those datasets is sufficient to ID you, then it is better to choose a single provider.

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Unfortunately it isn’t that simple, from the moment your device connect to the wifi for example, every sigle information/packet/etc. shared or stored can be used to identify you, the more you share, the more can be collected to identify you. Now VPN alone by concept isn’t meant for privacy as you always have to trust the unregulated provider (contrary to your ISP for example), when all your data is tunneled through their servers, that’s a lone is big risk based on a trust only, however, and due to the nature of these shared IP vpns, sometimes maybe (keyword maybe) it’s challenging to pinpoint a specific client, and here comes the others, a browser that can have unique fingerprint, and now search queries that can add an extra source of information to further pinpoint you, especially as others mentioned below that you still need to enter your VPN code to use that search engine.. I haven’t tried it yet to give my personal experience as I stopped using mullvad, but if I did I will update this post further.

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