If you want a lightweight, official, long-term-supported Windows without bloat:
Microsoft released an official "Lite" version called Windows 8.1 Embedded Industry Pro.
"Better" implies performance superior to the official retail version. "Free" is obvious, but legally gray. While Windows 8.1 keys are no longer sold by Microsoft, existing licenses work. "Better free" often points to pre-activated or KMS-patched versions.
You might ask: Why not just use Windows 10 LTSC or Linux?
Here is the reality check: Windows 10 still runs background services for Cortana, Timeline, and Windows Update that choke HDDs and low-end SSDs. Linux, while efficient, lacks support for specialized Brazilian banking software (GBP, Sicredi plugins) and legacy Windows games.
Windows 8.1 Lite, however, is a hybrid. It retains the kernel efficiency of Windows 7 with the modern driver support (NVMe, USB 3.0, UEFI) of Windows 10.
Rating for "windows 81 pro x64 lite ptbriso better free":