Jadoo 4 looks quite terrible actually... bad ratings. It says quad core and 1gb of ram, but it could be a quad core piece of crap or an awesome quad core, it doesn't mean anything.
I personally would stick with the RPI over the Jadoo, and not even mess with the Jadoo, because you can get a better device for similar prices.
But if you are looking to be cheap, and still get something better than an RPI than this may be for you.
https://www.ebay.com/itm/Intel-STCK...640305?hash=item2f1b4f3b71:g:xP0AAOSwn1RXIkjQ
It will be better for emulation, and it has an X86 processor. Still only a gigabyte of ram, and only 8gb of internal storage, but you can put a micro sd card in it, a class 10 card will probably be fast enough.
I would recommend the 2016 revision of the normal Compute Stick, but it's a whole $180, unless you are willing to go without an OS (in which case you will have to use Linux) which will then bring it down to $100. However you did not ask for this information...
Hope that helps
