Frenchies are very similar to Bostons both in looks and temperament. Also great smaller dogs.

Frenchies are great little dogs, but they can have breathing issues, more so than the terriers. Also probably a bit more spendy since they are csection births.
ETA: oh hell, looks like Boston’s have the same issue with c sections at least. One of my friends shows frenchies, so I’m more familiar with that breed. Little monkeys!

We have two Caviler King Charles and they are great dogs. They love to go on walks and absolutely love to snuggle. They are great with kids. Not so much of a good watch dog because they love everyone with the exception of birds and squirrels.