Well wilhelm has certainly demonstrated his expert knowledge there then.
The Multipass boiler is slightly higher efficiency, but this means the heat exchanger is bigger and so the boiler is bigger than the Euroflame. Only by an inch wider, until you get to the biggest multipass, for which there is no Euroflame equivalent.
The multipass is front access servicing/cleaning, and the Euroflame is top access.
As for the "get something else" comment, Grant boilers use Riello burners, and these are among the best available, the rest of the boiler is just a steel heat exchanger, so there isn't a problem. People making comments like this are worse than useless unless they can support their assertions.
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