I had not looked at Quark before. I thought it was just another scum coin. That looks very interesting indeed. A coin with a USP focused on security is definitely a niche. Of course there's the likes of Cryptogenic Bullion which strive to be extra-secure, but I don't think they have actually made any differences to the base scrypt coin other than increase the confirmations requirements.
I would caution against Quark. With 98% of the units mined Quark is uniquely vulnerable to a 51% attack. Quark's market cap was so small during the mining phase that ASIC miners were never built. The market cap is now huge but there aren't substantial incentives to develop ASICs for mining with only 2% of coins remaining.
On the other hand, a bad actor would have incentive to develop ASICs to gain 51% of the market network. That entity would then perform as much double spending as possible, gobbling up bitcoin/alts in the mean time.