I'm looking at one of these two mobos for my new build, and I'm not sure the price difference ($35) is justified for me. You might be familiar already with the DS3R, as it's a popular choice, but from what I can see, if you want to save some money, don't need RAID, can life with 4 SATA ports rather than 6 or 8 (I know the DS3R has a bit more), and don't need/care about "Ultra Durable 2", the DS3L might be the choice for you. It still has all solid capacitors. If you're not a hard core overclocker, and don't need RAID, what's wrong with the DS3L, or am I missing something?
The DS3L is a basic feature P35 board. It's a great budget choice perfect for single/two hard disk drive and single optical disk drive systems. Equip it with a good processor and good graphics card and you have a good midrange system. Overclocking is on par with DS3R. Neither board is meant for the extreme overclocker.