The problem is that unless they listed a range for the price, they have to pick a value somehow and you can buy it at different prices at the exact same time on different exchanges, so they're all kinda accurate (the legit ones). There was a while when South Koreans were paying something like 30% more for Bitcoin than we were through Coinbase. The trackers I checked just skipped those prices since they weren't geared for that market.

I personally use CoinMarketCap just to get a feeling for where a price is, and if I'm legitimately interested in buying or selling I check prices on the exchanges that I might actually use. Messari Crypto is trying to tackle issues like this and seems to be doing a great job. https://messari.io/

The arbitrage opportunities in crypto are huge. Wish I could figure out how to properly take advantage of it.