Whats the best tool to detect errors on media a tool thats honest i want the best tool to detect syrface errors and file errors..cheers

On the consumer level, PlexTools Pro combined with a Plextor drive.

wont work with me then cos i got a pioneer..

Suggest you read up a bit on "Read errors". There are no consumer based tools for detecting "surface errors" on optical media. For that you need a CATS scanner and a load of $. There's also a whole forum for these discussions.
None of these tools will tell you anything about file integrety, that's a completely different thing.

So whats this scan disc option for then on CD-DVD Speed, does it lie about the errors it finds in yellow??

Suggest you read the help files and other info on "read errors".(C1/C2, PI/PIF) Scandisc tells you how well your drive can read a disc. Another drive may give a completely different result. Any errors reported do not physically reside on the disc, but occur in the reading process as a result of the drive's error-correction scheme (or it's failure to correct). General conclusions might be drawn about the disc quality as a result of these tests, but nothing on the surface of the discs is being measured. Tests like ADER/ATER and Jitter do measure a small part of the disc's physical characteristics, but these are just part of the puzzle.
There is no "best" test, no "accurate" or "inaccurate", they're all just different tools for reporting how well drive A can read disc A.

thats why i just think fuck it to burning its all a load of hassle getting right media writers etc..i might aswell just use pcs for watching films and transfer them via network but i cant even do that cos they wont bloody network now ..lol

If you just want a surface scan Nero CD/DVD Speed is fine. It will tell you if your disc is readable. Chances are if everything is green, there should be no problem reading it. I've never actually seen the yellow come up on my surface scans so I don't know if how unreadable they are. Red is a definite coaster, even just 1 or 2 red spots will freeze a disc on a player. Don't get too discouraged by people reporting problems, that's why they access these forum, people without problems don't need to. I burned hundreds of discs on Liteon an NEC drives, the only problems I have ever had were with cheap media, spend the extra $.20 per disc and get something decent.

ok well thats made me change my mind a bit now..sounds a bit more positive to me!!

But if there are freezes on a film on a cd and the reason if because the disc has had a bad burn would it definatly come up with errors in the surface scan still??