I have 2 VPS's from the same company and both of the VPS's are on different nodes.
Are there any kind of test or utility I can preform to see which one has better connection, load, etc?
Is it possible to know from my end?
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Yes. You can run bonnie++ on your VPS.
BUT it depends.
The best thing for you to do is open a ticket and ask them to look into the issue. In this ticket ask the technician if your VMs are located on different storage arrays/network/system.
But honestly, it still depends. You're in a shared environment (even though it may seem like you are not), a specific level of service is not guaranteed, only an average level of service is "guaranteed".