Arrecife Airport and TUI diversions.
 

Sitting inside because of the rain, here in Lanzarote on holiday, I've been entertaining myself by looking at arrivals into Arrecife on Flightradar. Yes, I know I'm sad!. Out of roughly 55 flights that were scheduled to gave landed by 15:30 today, 7 diverted to Fuertenventura. Of these 7, 4 were TUI flights.
Is there any particular reason why TUI aircraft are more likely to need to divert than those from other carriers?

Likely TUI (and its various airlines) will have it's own SOPs for ACE and bad wx

7 diversions - 4 were TUI - the 3 others thought the same - so ACE was a no go

(probably a TUI day lol)
Thursdays and Mondays were historically UK-ACE package charter days (likewise TUES/FRI is a TFS day and MON/THURS was a LPA day
FUE was WEDS and SATS)

not quite so rigid nowadays because of the all low-co's

Rain? In Lanzarote? You must be really unlucky.......

You should have been here last night - 90 minutes of torrential rain with localised flooding. I think im right in saying that Lanzarote has been unusually wet this year.
Getting back to the issue of the diversions, I think TUI were slightly unlucky , as they had two flights scheduled to land within 15 minutes of each other, which coincided with a pulse of bad weather, hence the diversions.

You've answered your own question, it's all down to timing. If you arrive and the weather is below limits then you hold and when you get to the point where you need to divert, you divert. I suggest the TUI aircraft would have all loved to have arrived, turned round and gone back home, unfortunately the conditions didn't suit that at their particular arrival times.

Sorry, but there's no conspiracy.........

Arrivals to the Southerly runway ( 21) always an issue in poor weather due to terrain allied to the fact its not a particularly long runway. ILS approach to 03 should not be an issue unless you are unlucky enough to arrive in torrential rain and/or turbulence or crosswinds on or above limits. Departures on 03 can be a problem for the 737 depending upon conditions requiring a 21 take-off against the traffic flow. 757 usually has no performance issues at all so its just a question of weather unless you are at the back end of an arrival stream.