Both pronunciations are used, but /aŋ.gu.ɾi/ is more common as Wiktionary denotes. Pronounciations depend on the speaker and the region where (s)he lives. Although /aŋ.gu.ɾi/ is more common, I personally pronounce it as /a.gu.ɾi/, because I live in the northern part of the country.
Α similar situation occurs with the word τομάτα (tomata). Many people (me included) pronounce this word as domata and spell it ντομάτα. For more information click here