Are there any figures showing e.g. needs of ressources compared to
Transmission?
I am afraid that I can't answer on that. Generally, it depends on
the features being available.
Maybe you are looking towards memory consuption. Lemme answer shortly:
I don't care about that. ;o)
Imho, the plugin system is a good point though we
shouldn't leave lightweightiness of the XFCE spin too far behind.
Yeah. As stated above, more plugins - more features - more power needed.
Plugins do also mean more instability due to API changes and security
holes etc.
There are always PROs and CONs.