Which tattoo removal laser is superior? The Alex TriVantage, the Astanza Trinity, or the Medlite C6.

I've been getting rather unsuccessful laser treatments for going on 2 years with an outdated Medlite. I've put myself through a lot of pain and am seeking other options to see more progress. I had a consultation today and want to make sure I wasn't just "sold". I was quoted 4 sessions for an entire very colorful sleeve, and two smaller tattoos on my hips at $1500 total. Is this a fair price? They felt with the TriVantage, after 4 sessions, it should be light enough to cover.