Last time I went to get travellers cheques I was told “oh, no-one uses them any more, the cards are the preferred method”.
I took a card as an overflow backup, then cashed it back in when I got home. One thing to bear in mind is, certainly on the Thomas Cook card, if you leave it dormant for a period of time (18 months IIRC) they start charging you something silly like £15/month. So if you take out a card, check the small print or close it when you get home.
In hindsight, the card would’ve been good as a primary method of payment but a) you’ve no immediate way of tracking what you spend and b) I should’ve looked on MSE for the best cards before going “oh, go on then” at TC.
Historically, I’ve never had a problem cashing travellers’ cheques anywhere; even in non-touristy areas most places accepted them just like cash.