What is the general consensus on buying a subwoofer that is part of the same line as the loudpseakers that one buys?

Recently I ask about a set of Jamo speakers. The Jamo line has a subwoofer that is part of the D 4 line of speakers. Is is generally considered a good idea to buy for example, the D 4 sub to match the D 4 loudspeaker?

The set of tannoy Eyris loudspeakers that I will buy doesnt have an Eyris subwoofer to match--would it be a bad idea to grab the Jamo or a PSB sub, or should I probably grab one of the Tannoy subs to preserve the same kind of sound production throught the system?

Thanks in advance!