Yes, that was an unusually low word-count for me, I must have been having an off moment...
In short, neither... I just don't like them.
It's only an opinion of course, but it's an opinion formed, reinforced, and ultimately stamped into my aesthetic tastes by spending my teenage years in the wilds of Essex during the '90's. There the worst excesses of that counties famed complete lack of taste and class were realised in the form of halfwitted acne'd teenagers with curtain haircuts who had spent all their clearasil money on Peco exhausts, fake Nitrous Oxide and DIY tints and who would terrorise every street while engaging in "Anti Social Behaviour" back in the days when it was known as "behaving like a total tw@t". This has left a deeply ingrained impression, reinforced in the present day by hoards of wannabe East London plastic gangsta's doing much the same thing to more modern metal, only now they inhale the nitrous to get high as kites while upping the stakes with a bit of harmless stabbing and shooting. It's really not my demographic, although I suppose if I really wanted to look like Kanye West I could wear the anchor chain from my boat around my neck, strap an alarm clock to my wrist, stick a vapid bimbo with a bra size four times larger than the IQ she can muster from her vacuum sealed brain in the passenger seat and then tint the glass, but it's just not 'me'.
Of course, there are those who do it for reasons of protecting their offspring from the sunlight, presumably having watched to many confusing vampire movies. Understandable, but it's not essential. My formative years as an innocent young boy included many hundreds of hours spent baking in the summer sun in the greenhouse like confines of the back of my dads Volvo 240 estate. In Saudi Arabia. Even though it was fitted with dark brown vinyl seats that could sear the skin from your legs after only a few seconds in direct sunlight, and air con that was like having a man blow air at you through a drinking straw, my little brother and I escaped the horrors of the blazing desert sun and temperatures in excess of 48C. Never did me no harm... (except perhaps for a few third degree burns and some permanent scarring to the backs of the thighs, and some relatively minor skin and eye damage...)