Whatever makes you sleep @ night

Every TCP/IP stack is just fine and works without issues.
- Roadshow is a fast and maintained stack (but I haven't tried yet to say comments)
- MiamiDx is easy enough and works out of the box.
- AmiTCP is just fine and works awesomely well (and can be equal or even better than Roadshow if configured correctly with cache etc). Also it's still maintained by AmigaKit who bought the licences for EasyNet.
I'm using MiamiDx in everyday bases, and also bought EasyNet some weeks ago to support AmigaKit for their effort.