I am outing myself to anyone who knows me, but I have four coffee machines!
It depends on what you like from your tassimo. If you go for the 'proper' coffee, then you have options. If you like it for the other drinks (like the flavoured lattes, hot chocolates etc), the only ones that are really going to do that are the tassimo, dolce gusto and maybe senseo.
The dolce gusto is very similar to tassimo, but you don't get the same branded makes (e.g. tassimo have costa). They are okay for the flavoured ones but not that great for a proper coffee.
I have a built-in bosch coffee machine, which is bean to cup. It makes a great coffee and different types of coffee. It does take more cleaning though as you have to clean the mechanism and empty the grounds. It isn't that much of a hassle, and it is only when it tells you to empty it, but if you don't want to have to deal with that it isn't too great.
We then have two Nespresso machines as DH only drinks black coffee (and he doesn't want to wear out the good machine). We have an original and a vertuo machine, but tend to just use the vertuo.
It gives a great coffee, but it is really only for you if you like black coffee (or add your own milk - they don't really do lattes, mochas etc).
The Nespresso own pods are aluminium. Yes it gives waste, but you send or drop them back and they recycle them so it doesn't feel too bad. Just watch out for own brand or cheaper pods as they tend to be plastic and not recyclable. We also had issues of some plastic ones crumpling in the machine under the pressure.