I used to prefer Aldi, until a Lidl opened in walking distance and next door to my DC's school, and now I really love Lidl. The bakery is amazing. It's so easy to have friends round for brunch/lunch as I grab bakery things from Lidl, I've given our the mini pastries to parents at kids parties, my kids love the giant pretzels, I love the Portuguese custard tarts. I'll only eat Lidl croissants now, the ones in plastic packets don't compare from anywhere else.
In the packaged bread aisle the crumpets are the only non Warburton's ones I like. They do hot cross buns all year round which my toddler loves just plain out the pack straight from nursery.
In the tinned aisle, they do chunky soups which are as food as casserole. My teen has them in her thermos for school lunches in winter, they do a really lovely lamb and mint one, and a chicken and vegetable. I love that the very cheap Tuna fish comes with ring pull lids. As do all the tins I think.
Multipacks of raisins are very cheap, I think cheaper than Aldi.
Nappies are much much softer, less grainy and less garish than Aldi. Wipes are great. Organix cereal bar boxes are a good price.
The Lidl waterproofs they do a couple of times a year are amazing. Adults and kids. Very cheap. Lidl Christmas toys are great, but I think Aldi offer very good wooden toys too but I think Lidl are superior with the Playtive range.
I love the large buckets of Greek Yogurt at Lidl, and the sweet potato fries. They have just bought our fake orange Aero, and their dairy free mint creme chocolate is divine. My toddler loves the cheap tortilla chips.
In all honesty it's almost identical to Aldi, except Lidl has the bakery. I'd stick with whichever one is closest.