kanlukasz, Dell SupportAssist for PCs (formerly My Dell/Dell Support Center) automates support from Dell by proactively and predictively identifying hardware and software issues on your system. SupportAssist addresses system performance and stabilization issues, prevents security threats, monitors and detects hardware failures, and automates the engagement process with Dell Technical support. Depending on your Dell service plan, SupportAssist also automates support request creation for issues that are detected during a scan. Dell Update (for consumer and client computers only) and Alienware Update (for Alienware computers only) are software that automatically updates critical fixes and important device drivers as they become available. This ensures that your Dell personal computer has the most critical updates without you having to check online and install them yourself. Dell Update software is supported on select Dell Inspiron, Vostro, XPS, and Alienware Update is supported on Alienware PCs running Microsoft Windows 7, Windows 8, Windows 8.1, Windows 10 and Windows 11. Device driver and application updates may help in the following areas: NOTE: Dell Update software is available for select Dell Inspiron, Vostro, XPS, and Alienware Update for select Alienware desktops and laptops.  
I was using Dell SupportAssist on my old laptop. I am currently using Dell Update instead. Both applications do the same - they search for the latest drivers and install them. So what's the difference between them when it comes to finding and updating drivers?
Difference between "Dell SupportAssist" and "Dell Update" for drivers update