Well, it all depends on what you want to do!

This is definitely not a recommendation, but as it happens, I have just ordered the following. As a bit of background (so you know just how reliable or not my comments are...), I've been a model engineer (that's important - people from an industrial background often have different views) for many years, and I've recently bought a second, much larger, lathe. Previously I used a Myford which took 8mm shank tools but they look a bit small in the new machine. So I've gone for 12mm shank, and I've chosen:

SCLCR + SCLCL right- and left-hand general purpose tools. These take the almost-square CCMT inserts, using the smaller 80deg angle. These are much stronger and less likely to chip than the DCMT inserts which have a 55deg angle. I have a tool which takes the DCMT but I prefer to use this for finer and finishing work where it's less likely to get damaged. I expect the SCLCR to be my main workhorse turning tool as it can turn and face without adjustment but the SCLCL will be useful for those odd "back edge of a shoulder" operations.

SCBCR RH rough turning tool. This one uses the CCMT inserts, but the 100deg angle (so can use the other corners of inserts previously used/worn/chipped from the other tools). Rough external turning, but won't work up to a shoulder.

I'm also getting the external threading tool which takes 16ER inserts, both 55deg and 60deg as I need imperial and metric threads. I also use a parting tool which takes GTN-2 inserts.

These are all external cutting tools as I have boring bars - all HSS except for some very small home-made from hardened silver steel for tiny holes - and I haven't gone to carbide insert versions of these yet. I haven't felt so much of a need for them. My biggest boring bar came with the "new" lathe and is something like 1" dia and about 12" long with a HSS tool. I don't expect to need it very often...

For what it's worth, I have ordered from JB Cutting Tools, as I have bought from them face-to-face at exhibitions and they seem to know what they are talking about (and their web site has a neat little set of pictures showing what each type of tool can do).

I still have some reservations about these carbide inserts as they can chip the tip very easily if mis-used. I'm hoping that the 80deg tips will be much stronger than the 55deg tips I have used to date. However, when they are working, they work extremely well, and can leave a good finish even from fairly heavy cuts.

What lathe are you using these on?