Thumbs up [Q] Update rom

Hi guys:
I`m sorry if this seems a dum question:
Can I update from this rom: cm-10.1-20140125-EXPERIMENTAL-beta3-ancora directly to the kit kat version?
Which one is the most stable and bugfree?
Im not able to solve the problem with the recognition of the sd card. It won`t recognize altough I format the SD card to FAT32 and then selected mount sd external card in recovery mode.
Any suggestions or help? Please.
Thanks.