Well, let’s look at the XB-14²:
- 4* Mic
- 2* Telco (tbh: Cleanfeed with XLR i/o connectors)
- 4* Stereo plus 3 on second level (with separate gain!) plus USB
= 8 Stereo channels (but not as comfortable as it should be for broadcast purposes)
Look at the Airmate 8 USB:
- 6* inputs where you can freely decide how to use them: Mic or Line (Stereo)
- Stereo inputs can be used on a second level: A/B (Ch. 1-4), Line/USB (Ch. 5/6)
… but all share the same gain: Mic / Stereo A / Stereo B
- 2* Telco with RJ11 i/o (from wall through mixer to phone)
can be switched to Line, if you want.
Do you really think it’s enough? Sure?
Although I have bought a second hand Airmate 8, I’m thinking about a sub-mixer for my mics because there are not enough channels for me… Stereo is fine, but what happens when I need more mics here?
Well, there are prepared sockets, yes, but a Velleman? Hm… 
@calypso60 what do you use? Isn’t it a zero-delay-(…)?
From my personal experience: Airmate.
The Airlite is the perfect all-in-one-solution, but I’m afraid, I wouldn’t be happy with it. At first, I wanted to have one, but the longer I thought on it, I was no longer convinced like at the first day I saw it.
That’s my personal impression, too.
I had the luck to work on an Airlite in a studio of a mAirList user when I was on travel in his region 2019 and I felt a serious difference in the feeling / handling.
Translated:
Of course, you can’t expect premium-workmanship or -audio quality compared to a DHD console that costs ten times as much.
Why don’t you add another (let’s say) 2k€ and buy an Airence (Main Unit and Expansion Unit)?
So you will get USB 1-4 like in an Airlite, Telco 1&2 with RJ11 sockets like in the Airmate and 6 free line channels in the expansion unit. 
That’s why I would prefer the Airmate 12 instead of an Airence when you need more channels.
Just my 5 Ct.