What are the differences between Tiagra and 105/Ultegra chainrings
For most people, they're just a bit pricier. The weight difference is insignificant for almost everyone (excluding possibly serious racers). 

As for durability, I'd expect its more of a function of maintenance rather than trim level. But I'd actually guess the "lower end" Tiagra part is probably a bit more durable since its probably got a bit more material on it.