For the future reference, I wouldn't recommend any. If I were forced to pick one, this is the order of preference:

1. Home Sweet Home Alone (HA 6): the production qualities are probably the best out of these unnecessary instalments, plus Devin Ratray (Buzz) and John Williams music in it. (The plot is about a nearly-broke married couple, who attempt to steal back a valuable doll they lost and assume it was taken by a posh British kid, so that they don't need to sell their family house. A bit confusing.)

2. Home Alone 3: it feels like a budget direct-to-video sequel (it had a theatrical release back in the day though); the main bonus point is young Scarlett Johansson in it (for anyone curious about her early career roles). The plot is about international terrorists who attempt to steal back a secret military computer chip they lost (which makes the unbelievable contrast of them being super-high tech professionals flying under the radar of law enforcement and at the same time being silly to jump on random booby traps set up by a kid.)

3. Home Alone: The Holiday Heist (HA 5): mostly rubbish, but it has a 2010-ish vibe (which may or may not be a bonus point). The story is about
an old, long lost Edvard Munch painting hidden in a house secret room that a group of thieves attempt to steal.

4. Home Alone 4: utter rubbish (in different aspects). The story presumably follows the original McCallister family and Marv (and his wife and mom) the thief who are all played by different actors. The story is about Peter McCallister getting divorced and having a rich girlfriend who plans to host a royal family, and Kevin deciding to spend Christmas with them instead of with the rest of his family (and spoiler alert:
he ends up defending the rich girlfriend's house from Marv and his wife). Spoiler alert: Peter dumps his rich girlfriend and goes back to his old family at the end.

And if I were to pick one to erase, it would naturally be the fourth one.