Just to chime in, in the armor modeling world, OOB (out of box) is a category used in both description and competition. It means building as is without alterations or aftermarket parts except for glue and paint. In competition, the directions need to be displayed with the model.

In the RC world, it's RTR or RTF (ready to fly) There's also BNF (bind and fly) that comes without radios. As Dan said, in Asia, Tamiyas come stock with Futaba Attack Tx/Rx, that's why it's featured in the directions.

So if you're buying an HL, Taigen or Tamiya and swapping out for or adding a Clark, Benedini, different gearboxes, servo elevation, it's no longer OOB.

I'd go with Tamiya myself. I love my HL Stug, but it took ordering from about 6 different sources to get it there, plus a ton of modifications and work. OOB, it ran for a hour or so and crapped out. My first Tamiya (Tiger I) is still a flawless runner after 10 years, no work, barely even maintained and that's after my son has been rolling it off walls and down stairs this past year. My most recent Tamiya (pz IV) was built and running in little time with zero hassle.