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Apart from the electrical connections being different they have slightly different applications. A speaker will mimic all the noises the panel makes, if you have a good panel you can program volumes etc. Sounder is just a loud noise typically only in alarm conditions but would depend on output programming.

A speaker is a speaker, ie needs a speaker signal. A sounder needs switched voltage (in our case 12v) to sound.

I still don't see how you can slag BT off out of context. This thread is about a product they probably don't even remember they put there name on as a rebranded product. If we are talking about as a teleco company when we say "systems" then they don't have anything to do with the network any more it's all Openreach now, that wasn't their doing. With domestic services like this it often comes down to cost, it's so easy to compare prices now and they pretty much provide all the same thing. Only need to speak to them if you have an issue and from what I gather BT are fairly decent on the customer services front when it comes to complaints (OFCOM).

I'm certain I saw the BT Visonic alarm being sold in in PW World or Argos over 10yrs ago I would be very surprised if any one at BT even knew they once had it as product

Or a dog? Or combine both with a therapy dog?

have you considered therapy?

this is a bit of a noob question but what's the difference between an internal sounder and an extension speaker?