[CursedMagus]

I think any class will have trouble soloing except a cleric because they can heal themselves. Full END fighters have a hell of a time killing things even if they survive well. It will become tedious and takes them forever to level if they plan on solo-ing. I suspect a full SPR fighter might, just might, actually solo a tad bit better than full END fighter. Then again, I'm not very well informed about fighters, but just throwing this opinion in from what I see and have supported as a cleric.

It depends on what you mean by "trouble". Being a Cleric is easier than other classes due to the fact that they can heal themselves so easily. But the only problem is, is the amount of SP the spells use. I was using up so many SP potions it wasn't even funny. I had over 500 Tier 1 SP potions in my storage about less than a week ago. Now I don't even have 200 of them. I just went back to being my Mage. Besides, Mages are more wanted for parties than Clerics are because there's always too many Clerics. Lol.

Anyways, if you got more defense it'll be easier to solo. You can take hits better and you've got more HP. Also if you use a sword and shield you've got speed and extra END along with the ability to block. And thats increased with END as well. A pure SPR Fighter only has the chance of getting more criticals than a Fighter who isn't pure SPR. But that means he'll never be able to tank as well as someone who's pure END or some other hybrid involving END.