Sorry, haven’t read previous posts as it not the most engaging of threads.
Been to both, Aldi being my go to for food basics. Aldi for most basic cheap stuff but limited choice. Lidl appears to be a step up in food choice. When buying absolute food basics Aldi is cheap, haven’t food shopped at Lidl enough to compare. Aldi appear to have more tat none food and a good 3yr guarantee on some stuff, Lidl none food tat is more limited, not sure about their guarantees. Both have plenty of Euro food, dried sausage, stollen etc. You have to be a bit careful with Aldi (and I presume Lidl), they’re not always that cheap on some stuff. For example a few years ago, real coffee at aldi was £1.99 for 200gms, Waitrose own brand real coffee was £3.95 for 400gms, so about the same price per gm. The basics are however very cheap at Aldi, or they were a few years ago. You should probably do a price/weight/size comparison against your usual shop, as other grocers are actively competing against Aldi/Lidl now.