I note that the OP has already made up their mind about what poles to carry. But there are a number of posts that indicate individuals have had problems with their poles. Some of the issues I have seen from time to time, and when I have seen them, have been relatively simple to fix.
On the issue of using a telescoping pole vs a folding pole, when Black Diamond first introduced their range of Z-poles, my assessment was that these were significantly compromised designs. Both BD and other makers have made changes over the years, but even those with adjustable length and better handgrips and straps still do not have the characteristics I look for in a good trekking pole. Critical for me is being able to lengthen the pole up to 15 cm from my normal length when descending steeper slopes. On the caminos I have done in Spain and Portugal, such slopes are quite rare, and if that is the only place where one will use the poles, that mightn't be an important feature.
I have also written on
Pacer Poles. Suffice to say I am not convinced they offer any advantages to anyone who already knows how to properly use more traditional handgrips.
Traditional collapsing poles are not without their limitations, but the most common complaint so far seems to be that users have had to regularly adjust them in use. My experience is that poles with internal twist locks are less likely to suffer this, provided that the user has the wrist strength to tighten the pole section sufficiently.
Those with flick locks do require more regular adjustment to ensure the lock tightens enough around the shaft to provide sufficient friction to prevent the a lower pole section slipping. Older designs might have required a small screwdriver or small coin to make this adjustment, but more recent designs I have used have adjustment knobs that don't require any other tools to use.
I have never had a telescoping pole seize, but I occasionally disassemble my poles and remove any dust that has collected inside the pole section from regularly adjusting the poles. Normally, I expect this would be more likely to make the poles slip than seize. But I can see that if a pole is not adjusted regularly, the aluminium shaft might form an oxide layer that would effectively glue the two pole sections together. Storing the poles collapsed might reduce the prospect of this occurring.
And a final note - whatever poles you choose, learn to use the straps and handgrips correctly. It is the one thing that distinguishes your very expensive poles from a simple wooden stick. If you don't learn this, I think you might well have wasted your money buying a technical trekking pole!!
