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lwIP vs. TCPnet?

I'm evaluating TCP/IP stacks for the STM32F207. Keil's TCPnet is attractive in terms of simplicity and performance. The other contender is lwIP. I've pushed three other stacks (Micrium, Segger and Elmic) below the yellow line for now.

My application is very simple, primarily exchanging data with a host via a single TCP socket. No webserver, FTP or other higher-level protocols involved.

Has anyone done a shootout of TCP/IP stacks lately? I'm interested to hear if there are meaningful performance differences. Also, each stack has a "preferred" RTOS (RL-ARM for TCPnet, FreeRTOS for lwIP) so that decision plays into it as well but either RTOS would work for me.

Thanks,
Andrew