Only downside is sometimes larger micro SDs can sometime be a b*tch to initialise in the box and have to be done on a PC. Not a hardship, just something to be aware of.
I've used 128gb with no problems. Just make sure it's class 10 and format it to ext4 on your pc first. MiniTool Partition Wizard highly recommended.
Try both and go for what you feel more comfortable usinghi guys im new to this how which would you say is better open vix or wooshbuild? im looking to flash my box because i dont think there are any update for openvix anymore and my box keeps freezing