From my perspective. Definitely.
But depends on how you are using it? And what's important to you.
Do you for instance use it under your camera? The DR60D was designed for it, but I found the stack to be a bit crazy high! The MixPre3 at least is super slim.
You'd gain a channel, as the MixPre3 can record 5x ISOs:
https://www.sounddevices.com/product/2-plugin-for-mixpre-3/
(note: uses the 3.5mm input. Sooooo... if it is a Gen1 device, you've now just lost the ability to use TC if using the 4th channel)
Gen2 can hold TC by itself.
Gen1 can't, always needs a TC box attached to it
I think the ergonomics of the MixPres are bad compared to the F8 Series, but yeah compared to the Tascam DR60D you probably will like the more modern MixPres, with their pretty color screens and mobile app.
Ohhh... maybe that's something to fix first! Before changing your recorder.