If they offer you to go voluntarily, I would always always always do that over being sectioned.
When you're sectioned you cannot leave, may not get any leave to go outside, can be pinned down and forced medication, not a lot of choice in your care and no rights or freedom basically. Your driving license will be taken away.
Although usually if you go in voluntarily they may section you anyway if you try and leave.
Avoid hospital if you can as they are horrible and (I personally) do not believe they help you recover or offer therapy as it's just a holding cell with meds, but if you can't, always go voluntarily as you would have more freedom.
No one wants to be sectioned, and refusing to go into hospital when they offer a voluntary admission is stupid because why would you want your rights and freedom to be taken away? not worth it imo