I have 5 scopes on my 5 rifles, two are SFP and three are FFP. They all work for me.
T3 reticle in L&S Mk6 3-18x behind UTC-x on 3 power. Click on the pic to make it larger.
So, even in the crappy thru lens pic, you can see the cross hairs fine and with mk1eb I can see the 1 mil hold lines fine. Can I see the .2 mil hold lines ? No.
The way I usually operate is with the scope on lowest power for scanning, then if I see a target and there is time, I dial up the magnification to maybe 6x. Don't want to dial up too much and loose FOV for other targets that might be out there. That said, the vast majority of shots have been on lowest power and inside 300yds where the critter is the reticle and I'm just aiming with the crosshairs. Holding up a little if necessary, using the critter as the reticle. Like at 300yds holding up on the top of the back of a yote with 308. I memorize my DOPE at 50yd increments from 250 to 500yds and use radius or raptar range finders.
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Scopes I use with thermal clipons
NF 7-35x T3 (FFP)
NF 4-16x T3 (FFP)
L&S mk6 3-18x T3 (FFP)
NF 2.5-10x MIL-R (SFP)
Zeiss 4-16x MOA (SFP)
They all work fine for me.
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The reason I got the SFP scopes was weight, not reticle.
NF 2.5-10x is 20.5 oz
Zeiss 4-16x is 21.5 oz
The lightest FFP I have is the Mk6 at 23.6 oz ... the ATACRs are a good bit heavier.
So weight savings and forcing myself to dial for longer distances, so I don't loose the skill, are the reasons I got the SFP scopes. But the market for SFP scopes with zero stop (which I require) and parallax (less necessary, but still useful for groups at 100yds) and illumination (good idea to have) squeezes the SFP market down quite a bit. But the NF and Zeiss I have, have all those features.