Tricky one to answer, because I've no experience of putting a milling table on a pillar drill.
I have tried a cross-slide vice on a pillar drill and it was a complete waste of money, but the tables Wayne is asking about should be better. Wayne has a 'very good big pillar drill',which should be less bendy than my cheapo drill.
Irrespective of how well-made the table is, it's unwise to build a pagoda on top! Putting a table on the pillar drill adds height and reduces rigidity and accuracy. Adding a swivel vice to the table as well will make the problem worse. Whether reducing accuracy and rigidity matters depends on the job. If the holes have to drilled better than ±0.05mm, a tall set-up probably won't do, but it should do ±0.1mm. Designs are often changed to reduce the accuracy needed. Or the table is carefully used to make a jig and/or fixtures that position the job accurately for drilling. Jigs & fixtures are excellent for repetitive work because they provide speed and accuracy.
Of the three tables listed by Wayne, they look similar to me but it's hard to tell how well things work from a picture. The XY locking is done as in this photo pinched from ArcEuro. It done by tightening a screw, in this example an Allen type, against the gib strip:

The 4 gib adjusters are tweaked so the table moves smoothly from end to end without binding or wobble. Takes practice to get right, and may not be perfect on delivery.
I guess they would all perform about the same. Things I would look out for:
- Imperial or Metric (I much prefer metric)
- A rough scale on the table is useful for rapid positioning, otherwise the user has to count wheel revolutions. Should be possible to roll one's own. Fitting a DRO is probably over the top for this application.
- The wheel-scales are probably resettable so X&Y can be moved relative to a user zero, but it's a right pain if they can't! Mental arithmetic required.
- How conveniently will the table fix to the pillar drill? Much depends on the layout of the drilling platform: hole and slot positions, ribs that get in the way of clamps etc.
Of the three:
- ArcEuro score high on reputation. Their table is almost certainly metric, no claims made for accuracy. I can't see from their photo that the wheel scales are adjustable, however the photo of next size up shows the they are and I doubt the scales on the smaller table are different. Can't see a rough scale. The table is clamped to the drill platform, or there are small bolt holes in the corners.
- Amadeal table also metric, and they confirm the scale is adjustable in 0.01mm increments. (Actual accuracy unlikely to be this good!) There's a rough scale fitted. The table has U shaped bolt holes, I guess 6, which might match the pillar drill platform, or it could be clamped.
- Chronos table has accuracy quoted in metric but the scales are Imperial. No rough scale. The photo of the table has long fixing slots, which stand a better chance of aligning with the drill platform, but the scale drawing shows 4 U holes.
Of the three, only the Chronos has a specification:
- Accuracy 0.06~0.08mm/200mm
- Parallelism 0.06~0.08mm/200mm
- Backlash 0.06mm
Not good compared with a milling machine, but I think representative of what you should expect of drilling tables.
None of them come with clamps or T-Nuts, so budget for these as necessary.
Which would I buy? Not the Chronos, because it's Imperial. Probably the ArcEuro because it happens that my drill platform is better suited to clamping than bolting down through U holes and I already own a clamping set. But if ArcEuro were out of stock, the Amadeal table would do. Not vital for me to save a few quid, so I'm not influenced by the AMA being a shade cheaper. If cash is short, don't forget to if check Post and Packing is included when comparing prices. In the event a dud table arrives, though ArcEuro has scored loads of customer service brownie points, the other two companies can be expected to replace or refund without much hassle.
Beware of buying cheap from the Internet. Risky if anything goes wrong, for example buying an iffy factory second and finding the Terms and Conditions require it to be sent back to a depot in Germany at your cost…
Dave
Edited By SillyOldDuffer on 04/02/2022 12:04:08