Having owned both of these machines both now and in the past, I might be able to give you a reasonable and user based opinion.
These are two very different machines the sedgwick is a very robust machine made primarily of cast iron (cast iron isn't quite the panacea most seem to think it is) but it's a tough machine not much goes wrong after 20 odd years, it vibrates a bit on full chat. Setting the machine up is time consuming. The ring fence for curves is a very time consuming to assemble and imho it's not much use as a tennoner. The table is a decent size and flat as is the fences although most owners/users fit sacrificial ones.
The Felder isn't cast iron (only the top is). The one I have is more powerful than the Sedgwick and vibrates a tiny bit at full speed (the max speed is greater) It is very accurate and much easier to set up as it has micro adjustments. The spindle tilts (very useful) The sliding table is much closer to the cutterblock making it a very decent tennoner. It also has a quick change spindle which I use a lot. With all the controls at the front it is way quicker to setup as is the euro hood for curved work, it extracts the dust much better than the Sedgwick. The sliding table is accurate as is the alloy fences, the extension tables align accurately with the table.
The Sedgwick made hundreds of windows, doors, door frames, bow windows , arched windows, run thousands of metres of mouldings.
The Felder has made hundreds of windows, doors, door frames, bow windows , arched windows, run thousands of metres of mouldings.
The Sedgwick is a not many frills robust run all day workhorse. The Felder is an all singing dancing electronic run all day workhorse.
Choose which one you want really, if you want an opinion I suspect those reading this will already have sussed which one I'd go for :lol: .
IMHO a new Felder is way too expensive now, you can pick up a good Sedgwick for a fraction of Felder money and that would be my choice for someone starting out, for the simple reason the s/hand machines are cheapish but the real costs are in the cutterblocks & tooling, either way you won't be disappointed with either.