Which of these accelerator's would I be better off getting?

[rare_j]

If you want to use OS 3.5 or 3.9, yeah. Otherwise, probably not. Although, with a Blizzard you can softkick 3.1. This is illegal, though.

Is it really illegal though?

I own an A1200, I have a licence to use the 3.0 Roms. Would the copyright owners really begrudge me softkicking the 3.1 Roms, the difference being just a few buigfixes?

In PC land flashing your motherboard bios is offered as 'support'.
In Amiga land, updating your kickstart by a minor revision is 'illegal'.

[rare_j]

Yes of course - I respect ip and copyright. But I can't believe the copyright holders, whoever they are these days, would object this particular situation; a legal user of the 3.0 roms in hardware ugrading via software to version 3.1 ... maybe it's time someone contacted them to ask.