Depends on your use. I can recommend two clocks- the DGT 1002 and the DGT 3000. DGT 1002 has less time controls and stuff but is cheaper, while the DGT 3000 is a pricier clock complete with all the time controls.
Chess clock suggestions

DGT 3000's pretty good and popular, but I prefer DGT 2010 (kinda easier to use for me), plus it's cheaper

yes, the DGT 2010 is a pretty capable clock too, but its kinda old and the design's a bit outdated. The DGT 3000 is pricier but comes with more features, looks more aesthetically pleasing.

I've got a LEAP clock, which is pretty good. It has 29 preprogrammed settings, and you can also set a custom time. I would recommend it. Or you could pay £20 more for a DGT which does pretty much exactly the same thing.

I think you should get the one that is programmable via your smart phone because I’ve been curious about how well it works and don’t want to take the plunge myself!

I have a Chronos which is really good but expensive if you buy new.
Jealous of you sir those are the best

The Z-Mart Pro series of clocks are nice in my opinion, though I don't think they're as durable as some of the models mentioned above...best to think about a bag or case to carry your clock in as well good luck
I'm thinking about buying a chess clock if/when I have some extra cash... it's been too long since I got my clock. Any suggestions?