I like System Informer more than Process Explorer by Sysinternals because it is open source. You can manually use it to check for viruses among running processes, while Process Explorer makes it automatically.

Why "System Informer"(ex Process Hacker) better for me than "Process Explorer": Support multi-select for process list. So you can kill or suspend many processes at once. Can collapse child processes to a single line, calculate total CPU/RAM usage and remember this for the future. Can open file location, show service name in the context menu for processes. Can hide system processes. Have a services tab. Where you can search and manage services. You can jump from service to process also. Looks like not fully working in the current version though.

Only little a bit of missing button "Process Tree" from "Process Explorer" in the toolbar. Saves 2 clicks xD

Is the same GitHub link (and program) named Process Hacker (https://alternativeto.net/software/process-hacker/about/), be carefull, its a risky app.