couple of points to clear out though;
1| you could mount rad outside case on the back or remove the top ABS plastic housing to have the rad go on externally. As opposed to an internal *clean* look, the external rads will pull/draw cooler air in through the fins to net better temps. Which is one of the reasons you're watercooing
2| although there are mounting holes inside the case, an internal layout together with all the obstruction in the case - will hamper your airflow across the rad and the case overall -> higher temps.
3| heat rises so all the heat from your components eventually pass through the rad which will heat up your components hooked onto the loop.
4| I'd opt for a RX240 kit over both those kits. Thicker rad, slower rpm fans better temps.
5| with an internal layout your restricting yourself to stick within a defined raddage. You move on out of case, get a larger rad and ofc start going into custom watercooling territory to hand pick parts that will also go with a theme you may have thought out.
I still want to put it inside what would be the best option going from that standpoint. Could you possibly get a 2 times 200mm rad that would fit into the top and if so how would this effect the rest of the system?
^ that means yes, you can get 2x200mm radspace but my concern is...
you're using watercooling to cool your parts and move the heat from point A to point B where point B be the radiator and point A be the heatware. Point B being located inside case will be fed warmer air as hot air tends to rise no matter what you do. This will inturn warm the heatware and raise your temps. Furthermore if you think of running the fans in push or pull mode in intake on the top of case, the heat will also be thrown into case and subsequently be absorbed by the mobo and components not to mention the GPU should you include it in your loop.
Hence this will affect your overclocks, product longevity and in the long run -> how happy you will be with your system overall.