MP 1,1-5,1 rEFInd? Next Loader? Boot Manager? Which do you use and why?

[webbp]

I want to triple-boot my Mac Pro 5,1 into macOS 10.13.6 (likely to upgrade later) (for desktop applications and general use), Windows 10 (to edit GPU BIOS and for occasional gaming), and Linux Ubuntu 20.04 or Pop!_OS (for GPU machine learning training because e.g. no CUDA Toolkit 11 nor cuDNN 8 on macOS), and am trying to decide which boot manager to use. I've had success with rEFIt and rEFInd in the distant past, but there seem to be more options now.

Which do you recommend and why?

PS: I know I missed some; I'll add them to the thread title as they are mentioned.

 

[cdf]

OpenCore

OpenCore on the Mac Pro

This guide explains how to use the excellent OpenCore boot loader to install, run, and update the latest version of macOS on the MacPro5,1, resulting in a clean, unaltered operating system just like on a supported Mac.

forums.macrumors.com

RefindPlus

MyBootMgr: RefindPlus|OpenCore

This is a guide to using OpenCore and RefindPlus, to multiboot Classic MacPros (3,1 to 5,1) as well as equivalent Xserve (2,1 and 3,1). It involves booting Mac OS from one or more OpenCore instances chain-loaded from RefindPlus and booting other OS types directly from RefindPlus. The guide is...

forums.macrumors.com

Reason: Boot screen with standard GOP graphics card and protection from UEFI Windows.