These two species could hardly be more different from one another, apart from sharing their yellow flower colour. Both grow widely round here, and both have made their home in my border without me having been involved (I did bring in a plant of L.m. ‘Aurea’ with me from Scotland by mistake, as well).
L.m. ‘Aurea’ is of course Creeping Jenny, not to everyone’s taste particularly because it can become invasive, but an effective ground cover, in deep shade as well as sun I’ve found. I like to use it as a marker for plants that aren’t up when it is around.
Lysimachia punctata is Garden Loostrife, which I don’t know well and haven’t grown before, but it seems to tick a lot of boxes. I’ve found a website, www.perennials.com, which seems very comprehensive and helpful (albeit American; it needs a UK equivalent). It seems to tolerate any soil, any degree of shade or lack of it, wet or dry, acid or alkaline, not liked by rabbits allegedly, easy to grow, and long flowering. So far it doesn’t need staking either.
I don’t particularly like where it has put itself, next to Lychnis coronaria ‘Alba’, but at least it should be easy to move. I am warned about avoiding the waterside plant Purple Loosetrife which is Lythrum, not actually related, and I know can be invasive.