L8437 Hi so I really miss the lightweight and smaller feel of the pixel 5 Vs the 6 pro, including the battery life.
The Pixel 6 or the weaker, budget Pixel 6a is slightly smaller and has slightly better battery life due to being a weaker device and should be a better choice for you. Using the 5 is not recommended because security updates will stop soon (see bottom response).
L8437 How much better is the titan M2 security chip on the pix 6 pro?
The Titan M2 is faster and has more memory, and therefore can store more secrets. The original Titan M is an ARM processor part of the SoC while the Titan M2 is an independent RISC-V processor. The Titan M2 also has vulnerability assessment certifications.
L8437 What are the vulnerabilities of the pix 5
The Pixel 5's support ends in 5 months. You won't receive security updates after that time. The 5a ends in 1 year and 3 months, while the 6a ends in 4 years. The 6a is recommended by the developers as the budget and smaller device to use.