There are a ton of mobile deployment options that support PyTorch+TF models. It's hard to argue TFLite is the best.

https://github.com/alibaba/MNN

https://github.com/Tencent/ncnn

https://github.com/Tencent/tnn

https://github.com/XiaoMi/mace

Plus, each chip vendor has their own SDK (e.g., Qualcomm has SNPE, MediaTek has NeuroPilot)