Yes, but the low-latency kernel part is important. Default Ubuntu has the generic kernel but it is easy to switch.
Alternatively, you can go for Ubuntu Studio, an Ubuntu flavor that comes with low-latency kernel and more. The main difference is the desktop offered out of the box (GNOME for Ubuntu, KDE for Ubuntu Studio) but even that can be changed after the fact. If you are interested in Bitwig, only in Bitwig, and want to be on the safest side with the underlying tech, I still suggest plain Ubuntu with low-latency kernel.
To me, this belongs to the [advanced Linux users trying out things] I mentioned before. For me, it also belongs to less hours of sleep trying to go back to the normal. On this and similar conversations it is useful to remember why you are using a Linux system. In your case it would be because you want to use Bitwig and that’s it, correct? Most JACK - Pipewire discussions (or GNOME - KDE, or this and that…) are driven by people who enjoy tinkering with their Linux systems. The means are the goals. If your goal is to make music, I suggest you use the defaults and only change them if something is bothering you.
When JACK was Ubuntu’s default, JACK for Bitwig was fine. Now that Pipewire is default on Ubuntu, Pipewire for Bitwig is fine. It is that simple. Is JACK still fine for Bitwig? Of course it is. But you said you didn’t want to tinker, so don’t.
I don’t use Bitwig on Windows, so I have no idea. But Linux tends to outperform Windows when running the same apps on the same hardware, so I would say that surely not worse than Windows, and probably better.
That’s healthy regardless of your OS. However, many Windows plugins do work without problems thanks to Yabridge. In my experience, the plugins that don’t work or are a big pain to get to work mainly fall in two categories: those with an ethos and business model that anyway I don’t like (iLOK, Native Access, etc; standard commercial / paid plugins are fine), and those that are so complex and deep that make Bitwig mostly a container, defeating the purpose of having a dedicated Bitwig laptop in the first place.
If you are using or are interested in some plugins, it is worth checking online or asking around. Chances are that they work on Linux + Yabridge. EDIT: (place here an enthusiastic sentence about CLAP plugins in the near future)
PS: shout out to the #linux channel on Bitwig’s Discord, where excellent Bitwiggers idle, chat, and help anyone with questions and problems, with extreme levels of patience. Almost everything I have learned comes from there.