Your question is definitely an interesting one. On one hand, you have a modernised digitally focused jet, on the other, you have an older analog type aircraft. I get what you mean by "it feels like Mother Russia is in the very bones of the plane!". Older birds are an absolute blast to fly especially ones like the P-51 and F-86. However, if you're asking about versatility, in my opinion the Su-25T would be the better choice of the two. It's TV guided munitions and capability to perform in low light conditions with the aid of the Mercury LLTV pod are it's strengths. Not to mention it's SEAD capability, although it is limited.