I have used DVD RWs by HP, Sony, and Moser Baer, and DVD-Rs of the same companies and also by a junk company called Rainbow(Rs. 300/- for a spindle of 50).
As to the RWs, all have done equally well, and I like the colour of HP
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And as to the Rs, all were the same once again
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In all, of all the nondescript blank DVDs I ever picked up, only one absolutely crass batch of about 6 was there. The others were more or less similar to the reputed brands.