I have Wiz and Dingoo.My impressions are:
item: Dingoo/Wiz
Battery : 10/7
Controls : 10/7
Lcd : 5/10
Speakers 6/9
Appearence, weight (My impression) : 10/8
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Emu:
Snes 7/9
Sega genesis 8/10
PCE 8/10
GB/GBC 7/9
GBA 9/8
C64 10/7
MAME 8/10
PSX 8/5
CPS1,CPS2,NeoGeo 9/9
Wiz has a better front end...