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The only difference that I am aware of between the Ink PFI providers are services and management interfaces. I've only used PositionTech since it first started a few years ago. I've not had any experience with the others. Based on what I've read, they all pretty much offer the same thing. I believe prices are fixed across the board.
Also, after a week at Verisign the statistics still haven't started to show.
I don't register URL's at Verisign anymore because they fleece you, trying to collect 2-3X the competitive rate, and I'm not going to use their Ink PFI program either.
Verisign, IMHO, is a place for the uneducated to loose their money.
The only pain being a UK user is paying in $ with no VAT.
I don't know if you have seen it and not sure how the prices compare (because they are in £'s and might be cheaper or more expensive) but Webwurld (part of Webgravity) is a portal site to do Ink, Looksmart, AV and a few other bits, plus the payments include VAT, so if you are VAT registered you can reclaim.
Verisign is the worst.