One thing to consider is that if you connect your controller to your network(if connected to the internet) you will need to be concerned about viruses etc making there way to the controller. You probably shouldnt run virus scan software as it is fairly processor intensive and may interupt the machining process. You would need to experiment I guess.
The risk may be lower if you do not use any internet or email apps on the controller.
Re the units you linked... Depending on where your controller is located in relation to your wireless router etc, you may have more of a challenge with getting a good signal with the little tiny one. The unit with the antenna (given it works fairly well) may be better, but its hard to say.
Remarkable they can make a wireless unit that freaking tiny... Im in the industry and Im still amazed.