As a reverse engineer and malware researcher, the tools I use are super important for me. I have invested hours and hours in creating the best malware analysis environment for myself and chose the best tools for me and my needs. For the last two years, radare2 is my go-to tool for a lot of reverse-engineering tasks such as automating RE related work, scripting, CTFing, exploitation and more. That said, I almost never used radare2 for malware analysis, or more accurately, for analysis of malware for Windows.
The main reason was that radare2 command-line interface felt too clumsy, complicated and an over-kill. IDA Pro was simply better for these tasks, a quick inspection of functions, data structures, renaming, commenting, et cetera. It felt more intuitive for me and that what I was searching for while doing malware analysis. And then came Cutter.