Which of these six keyword combinations would you go after?
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Hotel Perth because adwords is showing the exact match while insights (i think) is showing broad match. My decision is based of exact match. This is only based off the information you have given
EDIT: I meant to say Hotels Perth.
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I would go for the phrase - hotels Perth. For converting traffic it is going to be the most natural search form. Most people are going to search something like: Find hotels in Perth, Cheap hotels in Perth, etc.
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Though not on your list, I would go with Perth Hotels. It has the best ratio of Keyword Difficulty to Exact Local Monthly Search Volume.
Keyword difficulty score 60 with 4,400 Exact Local Monthly Searches, according to the SEOmoz tool on Google.com.au.