Which bottom bracket - advise me please

When hollow techs do this it's often because they have been slightly over tightened when fitting. Then the bearings eat them self.

the BB cups do have sealed bearings, but you can still open them up to check if they need grease, the have a plastic cover you can pry off with a pin or very small flat screwdriver (jewellers type) , but in general terms this will only be a problem if you pressure wash your bike. Open them up and see what they look like inside

I would suggest that if you have gone through 2 already in such short mileage you need to work out whats causing the problem, as someone else mentioned, it maybe something else.

Sage advice from Charles there. 105 is at least as durable as dura ace, the latter is designed to be lighter rather than longer lasting.

You should get thousands of miles more from a 105.

Please do check your seat post though, lots of 'BB' creaks turn out to be a bit of grease and a nip up on the seat post.

I'd take it back to the LBS that fitted the 105 BB and ask them to take a look at it, might just need a regrease. Maybe ask them how to do it so you can do it yourself next time it squeaks, could buy the grease there as a good will gesture.