i think if you compare the two company's phones, that Nokia are slightly more durable and can withstand a lot of abuse. SE seem to always have joystick problems, my K800i has already nearly lost the down control after about 2 months of (general) usage. Nokia also seem to have more stable firmware. still, i think SE phones are better for user friendliness and customization, and if SE would would do stricter hardware and software tests, SE would be the ultimate phone company.