If you have not yet purchased one of these SDR boards, then I thought it might be interesting info for readers of this LimeSDR-mini topic.
73...de Ken W6HHC
I think that the comparison that you are after is here: https://wiki.batc.org.uk/DATV_transmitting_Equipment
There is no topic devoted to Pluto, because it is not the recommended hardware for any BATC Projects. For the Portsdown, we have gone with the LimeSDR Mini as our preferred SDR. You could start a Pluto topic under Digital TV, and if there is enough information, I can then promote it to the top level, but we need someone to do the research!