Hi Christian.
I have used both electric and diesel machines and will recommend an electric every time. Of course this is not everyones opinion but this is what i found based on say a G5 with generator and a V2. this applies to any 3 phase machine but i use a g5 as an example
1 The electric equipment fit in the van which meant i could go straight home. The diesel had to be taken somewhere and usually had to take someone with me to unload. Usually had to pay some way or other for that storage
2, The diesel was a pain to use when it was just 2 of us.
3, The diesel had to be put in one place and all pumping done from there. I hated using more and more pipe and the job sites were getting increasingly tighter.
4, The g5 would give me just what material i needed compared to the diesel which didnt like mixing small amounts.
5, Cannot use the diesel for indoor work
6, sometimes you go to a job and there is 3 phase power available.
7 Cleaning a diesel makes more mess which was a pain for us on some private jobs like extensions etc.
You may have seen a ritmo pumping which is slower than a diesel or g5. But i can tell you that the v2 may say it will pump over 70 lts but you will never need more than half that. The Diesel uses 1 rotor and stator and you just alter the speed. The G5 you have a d6-3 rotor and stator as standard that pumps about 20 lts and is quick enough for any rendering application but you can change this rotor and stator to alter your output there are loads of different versions for you to alter the output from 5 ltrs to 85.
PS i got a used g5 set up for sale so i am biased