All RME driver deliver very good performance.
> Which is better for my needs
The one which has the form factor and I/O ports that you require.
If you need mobility/USB, take Babyface.
If a rack mounted system has more advantages for you check out the FF800 (19") or FF400 (9.5").
Remarks in terms of firewire:
- Windows 10 Firewire support is not great, you will need something called the legacy driver
https://www.studio1productions.com/Arti … wire-1.htm
- You will need a Firewire card with a chipset which is known to work (avoid i.e. TI XIO2200A, it's broken).
This Exsys card with TI XIO2213B Fw chipset is known to work:
https://www.heise.de/preisvergleich/exs … 75938.html
All interfaces that you mention are only available on used market.
I am not sure whether "low latency" is really a very strong requirement for you as everybody usually says, "I want low latencies". I think that many people simply say this, because their current product has not so good ASIO drivers.
If I look to some reviews then some other products from other vendors have (compared to RME drivers) sometimes 2x as high RTL (round trip latency between recording interface to PC and back (and vice versa)) at the same sample rate and ASIO buffer size. With RME drivers you will stay below 10ms RTL with Buffersizes in the range of 32 - 128.
So all RME interfaces deliver to you low latencies so that its no problem to play VSTi's !
Multiface with the HDSPe ASIO driver allow ASIO buffersizes down to 32 samples.
The Firewire and the old USB driver down to 48 samples (FF400/800, Babyface).
Newer products which use the madiface USB driver also allow down to 32 samples with USB.
See here a comparison of different products that I used, you will see very good RTL values
and with RME you will have with USB / Firewire a RTL performance compareable to PCI/PCIe.
So I would concentrate on the type of interface that you need from
- i/o ports
- form factor
- whether you need mobile or not
- take USB if you want to connect it to a laptop as well
- Firewire support not so well under Win10 anymore, maybe better to take PCIe or USB
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13