There is nothing "better" about any function you get from a RGH3 console, however if your RGH2 booting experience isn't good - you might want to upgrade an already RGH'd console up to RGH3.
If your RGH console already works well for you, there is no real reason for you to upgrade. I only reccommend upgrading if you're unhappy with the current performance of the console.
Guide to converting an already RGH'd console to RGH3!
Required supplies:
- A USB stick to use for dumping / flashing your nand (via software, not a hardware programmer)
- A safety resistor (1k=Corona, 3K=Trinity, 22K=Falcon/Jasper) (For Slims Consider the RGH3 QSB which comes with the resistor)
- You might want an X-Clamp removal tool to make opening the console easier. It's been suggested to me that the X-clamp remover should be in the "required" supplies. For sure the X-Clamp can be removed without them, but the risk of damaging your board is very high if you're not very careful. You might want to check out this video clip of using the X-Clamp removal tool properly to see what you are up against.
1. Have or obtain a copy of your current or original nand.
If you've got a backup of your nanddump.bin from when the console was originally modded, then great. If not, you can use software tools like Simple Nand Flasher to dump the current nand onto a USB stick. Either method works.
2. Create an RGH3 image for your console
Load up your original/dumped nand into Jrunner and build a RGH3 image.
3. Write the RGH3 image to your console (before you remove any RGH2 wiring!)
Using software tool like Simple Nand Flasher, write the created RGH3 image to your console.
I'm re-hosting a copy of Simple Nand Flasher 1.4 beta here
NOTE: There are a number of software based solutions for flashing your nand. Xell itself, Nand Flasher 360, and probably others. As best I know you can use whatever your method have or are comforatable with.
4. Change the wiring to RGH3 wiring
Now you can remove the previous RGH wiring, and install the appropriate RGH3 wiring for your motherboard.
See my motherboard specific RGH3 guides for how to do the wiring depending on your motherboard.
5. Boot it up!
That's it! You're done! All without needing a hardware programmer thanks to your console already being RGH'd to start.
Video of converting a 4gb Corona from RGH2 to RGH3