For a first plane, starting with nothing, One of the Horizon's UMX BNF planes + DX6i is a great, affordable combo. Friendly, well tuned to fly and comes with the battery charger gear for the plane. The DX6i is not the best radio for the long haul, but it's a great starter radio, especially if you can find a bargain on it. It should easily last you a year -- possibly two -- depending on what you want to get into.
Of the two BNF's you mention, I'd point you toward the UMX Radian -- a very friendly 3 channel power glider. Simple controls, VERY stable, and in moment of desperation, you can cut the throttle and she'll eventually settle into a nice glide (and if she's headed to the ground, as long as the throttle is off, she's light enough to survive a modest crash). Overall a great airframe! if you're handy with tools, the wing magnet mod to replace the screws is a great improvement for packing and storage with almost no cost in weight.
Starting from scratch with building, the best route, IMO is the FT Tiny Trainer . . . but . . . this is not the best way to learn to fly. it builds fairly simple and is easy to repair, but for your first flight, maybe not so much. If you start with a airframe you've built yourself, when you run into problems (and you will) it's better to know the airframe is sound and the issue you're dealing with is a piloting skill you need to learn. If the airframe's trim and fit is also an unknown, you might be fighting against a mistake from building, trim, or just skill in piloting . . . so finding and fixing the problem has just become MUCH more complex.
Build your second plane? Absolutely! Keep in mind, when you build your own you'll also need to invest in the battery charger gear, which the UMX gear has, but won't migrate up to bigger batteries and power systems.