"Current" pagerank tool vs Multiple Data center PR checker

Please can someone tell me the difference between these two tools:


http://www.seologs.com/pr-check/pagerank-dc.html

http://www.seologs.com/pagerank/current-pagerank/currentpr-dc.html

My site (www.amoils.com) has been PR5 for years
(except a drop to PR4 two updates ago)

We have had a massive link campaign since last update
and I am hoping for a PR6.

On the multiple data center tool, my site has dropped to a PR4 on some servers, but on the "current" PR tool, some data centers show a PR6....

What do I believe....??

Please someone help!

This is at the bottom of the result...

"Disclaimer: Only Google knows your Current Pagerank. Although we think it is valuable, SeoLogs.com Current Pagerank tool is an experimental tool, and is only a theoretical guess of Current Pagerank"

There is nothing you can do about it even of you have a 4 or a 8.
Just wait a few days until it propogates to the rest of the servers and becomes visible.
You will go mad with all the checking and re-checking.