I like both but prefer L'Instant Extreme, since it's more masculine and its cocoa-tonka bean dry down is just heavenly that when I get whiffs of it, I stop whatever I'm doing and tell myself, "Mmmmm... Someone smells goooood... Oh, wait that's me."
I have recently just purchased L'Instant de Guerlain Extreme and its fantastic it really takes you on a fragrance journey. It opens with a warm freshness with citrus and coco then you get the florals with the coco. After a few hours you notice the woods with the heavenly coco then the dry downdown is yes you have guessed it a divine powdery coco.lol (how many times have I mentioned coco). Finally the basenotes are a sweet vanille musk which at this stage stays close to the skin.
I get 12 hours out of this fragrance and I love every minute of it and would pay double the price for this scent. It feels like a niche fragrance to me.
That "cosmetic" "lipstick" essence you get from DHI is AWESOME. I smell it hugely in Shalimar parfum Initial too. I cannot get enough it. It makes about as much sense as saying that a drink can be really "dry". But in it's own way DHI is really DRY in the most spectacular way. MUCH LOVE...(Now only if I can find a bottle for a steal of a deal!!)