I have had Sky, Sky+, SkyHD+ and now SkyQ, and have used the old boxes for freesat, I have found very few HD channels can be received using the SkyHD+ box without subscription, and as a freesat box the old Sky box likely the best as you could set it to auto change channel as set time, once they included a hard drive this feature was dropped, however that means SCART connector not HDMI so it is a bit of a trade off.
I use an Icecrypt STC3250CCIHD box for free to air, it worked with both terrestrial and satellite seamless between the two, however the satellite electronic program guide (EPG) is useless, it will often on show what is on unless you select the channel, you set channel order so I have ITV1, ITV1+1, ITV2, ITV2+1 etc, so some advantages, and it has more HD programs it will receive than even the SkyQ as I don't pay the extra for HD. As a second receiver it is great, SkyQ allows us to watch 3 TV's we have 4 boxes, so I can watch the Icecrypt when the other 3 boxes are in use, so can watch UK Drama for example, but UK Gold is encrypted so need SkyQ for that, so I can continue to watch a program in bedroom when I know what channel I want.
Free to Air is not the same as Freesat, with Freesat you use the Sky EPG so you get full 7 day guide, with free to air it is a bit hit and miss what the EPG shows. I have a number of free to air boxes, and the EPG is different on each, the Icecrypt also gets Freeview so I have the Freeview EPG, but since I use Moel y Sant transmitter there are very few Freeview programs available, and even when using Moel y Parc I found ITV3+1 would stop showing halfway through a program at around midnight so Freeview is not really anywhere near as good as satellite.
My TV should pick up satellite direct as free to air, however it only seems to pick up around ½ of the programs, I would guess either stuck on horizontal or vertical polarised, so it has a SkyQ box on it never worried about the free to air, I had an old Sky box with SCART and the Icecrypt connected to same TV at last house and even with non HD programs one could see the difference between the two SCART to HDMI on a 32 inch TV at 6 foot, but at 12 foot could no see the difference, I don't have HD eye sight maybe? So using old cast off boxes it is a trade off, but I like being able to set box to swap channel at 8 pm.