I had no end of trouble with Seadfest last year but had no problems the year before. Last year it ended up going to a paypal dispute to get my money back. Sadly I was not alone in having trouble.
But the seeds I got the year before were excellent, not sure if they have got their act together again or not, if you decide to give them a try be carefull, pay with some guaranteed method.
I have not used the other company.
I find the best place online for seeds, especially if you are looking for just a few is the swop shop on this site, if you have anything left over in your tin you can swop them for all sorts of wonderful stuff!
Happy hunting
Helen