What are the resolutions of the displays you're using?  Your best options would be the WD19 and WD19TB.  The former uses regular USB-C, and the latter can take advantage of Thunderbolt 3 if the attached system supports it, but is also backward compatible with regular USB-C systems.  The main advantage of Thunderbolt 3 is that it allows 4x as much display bandwidth as USB-C, so whereas the WD19 can support dual displays only up to 1920x1200, the WD19TB can handle dual displays up to 4K.

Since one of your systems is an XPS 15 9560, which requires 130W to be provided to the system, if you go with the WD19, you'll need to get the version that comes with a 180W AC adapter.  The WD19 that comes with a 130W adapter can only pass 90W of that to the attached system.  The WD19TB always comes with a 180W adapter.

Thanks for your reply. My monitors are:

 1 x Dell S2415H monitor 1920x1080, 60Hz

and

1 x Dell S2419HN 1920x1080, 59Hz.

Thanks. 

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@Jimtimber wrote:

Thanks for your reply. My monitors are:

 1 x Dell S2415H monitor 1920x1080, 60Hz

and

1 x Dell S2419HN 1920x1080, 59Hz.

 

Thanks. 

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@Jimtimber  ok, then here are your best options:

- WD19 with 180W adapter (for 130W Power Delivery).  The 180W adapter is necessary to support the XPS 15 properly.  The WD19 is a regular USB-C dock that will support your dual 1080p displays, but for dual display setups it can only do 1920x1200, so if you think you might ever want to step up to higher resolution displays, you'll want to look at the next option.

- WD19TB (comes standard with 180W adapter).  The WD19TB when used with Thunderbolt-enabled systems can support dual displays up to 4K 60 Hz because it can tap into 4x more display bandwidth than regular USB-C docks like the WD19.  It also has the benefit of being backward compatible with USB-C, although it will operate with the same limitations as a regular WD19 in that situation, i.e. dual displays only up to 1920x1200.

Hopefully this helps!