I have at least 80 nsps installed. 90% of them were installed with the devmenu though. Some were installed with tinfoil. If you use exfat, there is a slight chance of corruption if the install gets interrupted as I've been told. I had a hiccup once but it didn't cause any issues. Flashing a clean nand should do the trick though if you do have any software issues. It wont save your sd card though. But I doubt that the exfat corruption will happen often or even at all at this point as long as stuff is not interrupted If I am wrong please inform me otherwise.
I personally like nsp's now just because it feels just a littttttle bit faster with the loading times. They used to be smaller than xci's but that doesn't seem to be the case now. And plus its just less of a hassle to boot the game. Less button clicks.