The best analogy is that Helib is a homomorphic GPU while TFHE is a homomorphic CPU. Elementary operations (addition, multiplication modulo p) with Helib are slower (especially bootstrapping), but are performed on a huge vector of data simultaneously. In the opposite, elementary operations with TFHE (binary gates) are extremely fast, but deal with a single bit.

In other word, if the application you are aiming at is suitable for running on a GPU, go for Helib, else if it would be faster on a CPU, use TFHE.