Should I join the new team along with my manager?

Hi all,

Due to recent changes in the company (Big Tech), my current manager is moving to a new org and a new manager is brought to manage the team. I really respect my manager and they were amazing at supporting me (helped me grow from E3 to E5 in 2 years).

They mentioned the new team has an opening and mentioned that I'd be welcome to join if I wanted to. The new team is our company's top priority and based on initial understanding, their work sounds very interesting to me. Here are some pros and cons I could think of:

Not Changing Team:

• Pro- I have great relationships with IC6s on the team and also junior engineers.
• Pro- I know the codebase well and scope is well defined.
• Con- Been working in this space for 2+ years and feel slightly bored sometimes. Skillset also becomes stagnant.
• Con- Manager mentioned hard to find IC6 scope in the org moving forward.

Changing Team:

• Pro- Will continue the same manager, who I have a great relationship with.
• Pro- Exciting new space and top company priority.
• Pro- Manager considers me as high IC5 and mentioned potential IC6 growth opportunities-(although since manager hasn't joined the new team yet- so I should take this with a grain of salt).
• Con- Having to ramp up to a new team as an IC5 (seems a little risky considering layoffs).
• Con- Unknowns like work life balance, team friendliness, team success etc.

Considering these, I am planning to talk to the senior manager in the new org to evaluate their team and vision. Since this is a unique situation, how should I approach choosing between the two? What kind of questions should I ask? Thanks a lot!