New Zealand Passport living in Perth, WA last 11 years

1. Why I should care to get Australian Citizenship?

2. What am I missing out or will miss out if I live rest of my life on NZ Passport in Australia??

• I work full time in Australia in social welfare last 11 years and I understand I will get Age Pension too ( Is it same?? ) Reason I want to know what am I missing out is I am almost 44 and I only have 1 year to apply for almost impossible Skilled Migration point system PR

Thanks in advance