I use Ubuntu on my laptop (a converted C720 Chromebook with 64GB SSD) and find it very quick. I find Windows 10 OK (I preferred 7) on my desktop. If windows is slow on a brand new laptop then I suspect you need to get rid of the bloat ware. Look in the start-up folder for what’s running and start deleting things you don’t need. Have you virus scanned the laptop? Is the virus scanner running continually with too high a priority? If Ubuntu is running slow then it might be because it’s running from a USB stick and needs tweaking to get better performance (here’s one of many pages on this).
Installing applications like Chrome is usually simple as you just open the software centre, type the application you want and then click install.
For gaming windows wins hands down. I find it easier to develop small games on Linux as I’m familiar with all the tools I need but if I’m developing a large system at work then I go straight to Linux. The biggest win for Linux is that it’s cheap, it’s secure, it doesn’t have bloatware and it tends to run fast on low end systems. I just chose Linux on my laptop because I wanted a cheap laptop (a Chromebook) that I could develop on installing Linux was relatively straightforward. Another option is to set up dual booting so you have a choice of Windows or Linux.