Can anyone tell me the differences, opinions... between that receivers
(Degen DE1103 and Sony ICF-SW7600GR)?

The Degen is made in China by a Communist Party owned factory.
The 7600GR is made in Japan by a free enterprise company.

The Degen ergonomics S.u.c.k.s. which will make you curse every penny you
spent on it every time you attempt to operate it.
The 7600GR ergonomics are superb.

Repairs or replacement parts are non-existent for the Degen.
Sony parts and repair and relatively easy to acquire.

A technical manual does not exist for the Degen
Sony technical manuals are easily obtained.

If the Degen breaks toss it in the trash. Spend more money for another
receiver.
The Sony 7600GR is relatively well built and is repairable. But is less
likely to need repair.

You get what you pay for!