Hi Mrs H and welcome to CS!
So much to consider - first machine, budget, guests, quality, etc.!
Lets start with the machines you are considering:
1) The Sunbeam is easy to use and makes a reasonable coffee; its durability is questionable.
2) The Silvia requires a more disciplined approach and in my opinion, makes a far better coffee than the Sunbeam; it is robust.
If you purchase the Sunbeam, any support you need will need to come from this forum. If you purchase the Silvia online, again the support will come from the forum. If you by a Silvia direct from a Sponsor with a brick and mortar support should be more readily available.
Im afraid whatever means you currently employ to serve your guests coffee, will remain the best option, no matter whether you choose the Silvia or the Sunbeam. Neither machine will cope adequately with 10-20 consecutive coffees whereby your guests are served in reasonable time. You will need to step up to Heat Exchange (HX) machine for this.
So, I suggest that whatever machine you buy, you buy for your personal use and enjoyment.
We dont sell either the Sunbeam or the Silvia. We do sell the Lelit PL042, which has similarities to the Silvia, and an inbuilt grinder that will do a good job. I would ask that you consider this machine too.
As with all Sponsors, we are happy to demonstrate what we sell.