The i3 would be cheaper, but it wouldn't be "good" if you plan to turn it into a gaming system later. It could work, but considering the difference between the i5 that I listed, and the much less powerful i3-6100, which is only about 70 bucks, if you have plans to game on this machine you should really consider the i5 over the i3. The i3 CAN game, but it won't be AS good.
If the motherboard is an OEM unit, which that one is, then it is inferior, period. OEM manufacturers are in business to make the most amount of money with the least amount of investment, and generally that means using the cheapest parts they can reasonably get away with. You will not see a good aftermarket motherboard in any computer built by Dell, HP, ASUS, Lenovo or any other OEM system builder unless and except in a few very rare circumstances where it is a prebuilt high end gaming machine or workstation. Even then, it's extremely uncommon.
If you wanted a halfway capable system that could work for what you need now, but would be at least ok for gaming later, using an i3, then I'd suggest something like this, but the i5 would clearly be a better and more capable setup. Realize that while this isn't much cheaper than the other system I posted, it also includes a much better, higher capacity power supply that will be capable of supporting the majority of graphics cards in the even that you want to add one for gaming. If you plan to use a very high end AMD graphics card, you'll probably need a bigger PSU than this one. This should be fine for any graphics card up to an Nvidia GTX 970 or AMD R9 380x. Anything larger than that will require a bigger card, but I doubt you'll be getting anything near those, as you'll be limited by the i3 to some degree anyhow.
It also includes a larger, better case, to accomodate your graphics card and whatever else you may want to add. You could probably use the less expensive case included in the first build, but space might end up being a factor.
PCPartPicker part list /
Price breakdown by merchant
CPU: Intel Core i3-6100 3.7GHz Dual-Core Processor ($119.99 @ SuperBiiz)
Motherboard: Asus B150M-A Micro ATX LGA1151 Motherboard ($76.43 @ Amazon)
Memory: G.Skill NT Series 8GB (2 x 4GB) DDR4-2133 Memory ($32.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($45.99 @ SuperBiiz)
Case: Corsair 100R ATX Mid Tower Case ($49.99 @ Amazon)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($55.99 @ SuperBiiz)
Optical Drive: LG GH24NSC0B DVD/CD Writer ($15.89 @ OutletPC)
Operating System: Microsoft Windows 10 Home OEM (64-bit) ($89.99 @ NCIX US)
Total: $487.26
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-03-11 00:33 EST-0500