The one best for you would probably be the one that does what you are looking for. Any extras you might use in the future are a definite Plus.

Also make sure the one you choose can handle the amperage your system carries.

I have checked temp & amp draw with an ammeter (no load) Mine (a Novak) was within 1/100th of an amp.
I have no reason to believe anything from Eagletree could be less accurate. I have heard only good abouy their products.

Hope this helps