London to Frankfurt: plane or train?

Frankfurt am Main is a fair distance from London and budget airlines may be a good choice. Frankfurt airport is well connected by a frequent quick train to the centre of Frankfurt.

By train it would be 2 hours to Brussels by Eurostar, Thalys train from there to Koeln and change to ICE train to Frankfurt; there are a few ICE services straight through from Brussels to Frankfurt.

The minimum time on the train would be 5 and a half hours, up to 7 hours or so, central city to central city

All in on the plane would be an hour to the airport, 2 hours check in, 1 hour flight, 30 to 60 minutes with the arrivals process, 30 minutes to reach Frankfurt Hbf by train including waiting: - 5 to 5 and a half hours.

Pretty much even. No security theatre for the Eurostar, although there is a security check in London.

The cost for the flight is likely cheaper than the combined cost for the trains. The German train company DB sell inexpensive combined tickets on their website, as low as €69.

All bets are off if you take RyanAir on that route.
If you consider RyanAir you will go from a remote London airport like Stansted to a very remote airport closer to Luxembourg than Frankfurt called Frankfurt (Hahn) by RyanAir, which is then quite a long bus ride to Frankfurt.

This is a duplicate post - there are more responses so far on the Germany board.

I wasn't sure which country forum it would be best to post in since it involved two.

Here's the link to the other: https://community.ricksteves.com/travel-forum/germany/london-to-frankfurt-plane-or-train-3b718cc4-043e-48f8-bffb-80230425f5b7

I'll post my response there.