i went with the AGW. If they still have the LGW left, go for those, however, they didn't have the options in the size I needed, so I went with the AGW.
The new HiWin will cost you about double.
Either way, You want the ones that are preloaded bearrings. Z1 product code on them. Also, in a dusty environment, like a wood router goes through, it may be worth it to get the option scraper/seal kits.
stay with 20mm blocks and rails all the way around. If you can afford, I'd switch to 25mm rail for the y-axis.