I have no experience with Tian Hsia, but I have enrolled 2 of my kids in Berries since P1/P2. My eldest child is now scoring high As in Chinese (89,88) and my other child enrolled in Berries is steadily improving.
Materials from Berries are excellent and my children always use the Chinese compo book to help them in revision for Chinese.
In the PSLE composition, my daughter told me that the topic was actually a little similar (not totally the same, just a similar idea) to the one Berries had practised on with her.
Hope this helps!