I use the Fuji EF-42 as my prime flash, with the Yongnou 560II when more power is required, although it is a manual flash. I did have the Fuji EF 20 and whilst I found it to be a pocketable flash, I found it to be disappointing and overpriced, so I sold that to part fund the EF-42.
But I still liked the idea of a pocketable flash and I managed to source a Meike MK 320 on eBay, so far I have found to be as good on TTL as the Fuji EF-42, it is well constructed, tilts up and swivels sideways, comes with a pouch, stand and diffuser, all would be extra's with the Fuji EF 20, with an average cost of about £50/€70/$78 it is a very good buy, it also has a switchable LED light and interestingly it has a port on the side for a micro usb enabling rechargeable batteries to be charged in situ from any USB port!
Yes I can recommend the Meike MK 320 at less than half the price of the Fuji EF 20