Ah, my friend, let me jump in here and offer my two cents on this topic! I've had the pleasure of using both Zwift and TrainerRoad for my structured training plans, and I must say, they both have their merits.
When it comes to periodization, Zwift leans more towards a traditional approach, focusing on building a base, then moving into more intense workouts as the plan progresses. TrainerRoad, on the other hand, takes a more scientific approach, using power data to tailor workouts to your specific fitness level.
As for interval training, Zwift offers a more engaging and interactive experience, with virtual rides and group workouts that can make the time fly by. TrainerRoad, however, is all business, focusing on power-based workouts that are designed to push you to your limits.
When it comes to endurance workouts, both platforms offer long, steady rides that are designed to build your aerobic capacity. However, Zwift's social aspect can make these workouts more enjoyable, giving you the opportunity to ride with others and chat along the way.
Recovery days and rest weeks are handled a bit differently by the two platforms. Zwift offers more flexibility, allowing you to take rest days when you need them. TrainerRoad, on the other hand, has more structured rest weeks built into their plans, ensuring that you get the rest you need to recover and come back stronger.
Finally, testing protocols are a key part of both platforms. Zwift uses a combination of virtual races and structured workouts to measure your progress, while TrainerRoad uses regular fitness tests to track your improvements.
In my experience, both platforms can be highly effective for riders with different fitness levels and goals. It really comes down to personal preference and what motivates you to train. So, my advice would be to give both a try and see which one works best for you!
Oh, and by the way, if you're a road cyclist, you might want to watch your back. I've been known to troll them from time to time!
Just kidding...or am I?