from all the comments up to now I learned a lot.
My idea to replace my gas outboard by an electric one is only getting stronger.
I think that I prefer a solution with an integrated battery in stead of an external battery, although it can have some advantages (price, more easily follow a new technology by replacing).
That is the reason that the EP-carry is not so interesting (next to the lack of distributorship in Europe and the noise level!). Other solutions as Minikota, Yamaha etc. are not the best solution for me.
The Torqeedo and the Spirit seem to be quite equal but:
Noise level seems to be an advantage of the Spirit, but Torqeedo says that the new 1103 C can be better ( in their new folder they say 33 dB but I am still waiting for an explanation on that figure from their R&D department)
UV resistance could be a problem for Torqeedo: a lot of plastic and I red a lot of complaints.
The Torqueedo salesman warned me to to protect it from the sun if it is not in use.
Weight is an advantage for the Torqeedo especially because of the 3 parts what makes handling easier
Anti-theft protection is probably better for the Spirit (the battery can more easily be protected with a chainlock) and the 3 parts of the Torqeedo make this more complicated.
IP67 and seawater protection looks OK for both, the plastic of the Torqeedo is maybe safer then the aluminium of the Spirit but the Sprit has a floating battery.
GPS is an advantage of the Torqeedo but if some reviews are right it makes the Torqeedo much less reliable (and there are a lot of reviews where the reliability in general of the Torqeedo is a point of doubt for me).
Price the new Torqeedo 1103c is more expensive.
I am still studying the project but up to now I like to thank you all for your comments on this topic.
(a pity I could not correct the type error in the topicname, it must me electricity!)